psoutputdev.cc

这是一个做pdf阅读器的源代码文件,是大家学习阅读器资料的很好参考

  underlayCbkData = NULL;
  overlayCbk = NULL;
  overlayCbkData = NULL;

  fontIDs = NULL;
  fontFileIDs = NULL;
  fontFileNames = NULL;
  font8Info = NULL;
  font16Enc = NULL;
  imgIDs = NULL;
  formIDs = NULL;
  xobjStack = NULL;
  embFontList = NULL;
  customColors = NULL;
  haveTextClip = gFalse;
  t3String = NULL;

  // open file or pipe
  if (!strcmp(fileName, "-")) {
    fileTypeA = psStdout;
    f = stdout;
  } else if (fileName[0] == '|') {
    fileTypeA = psPipe;
#ifdef HAVE_POPEN
#ifndef WIN32
    signal(SIGPIPE, (SignalFunc)SIG_IGN);
#endif
    if (!(f = popen(fileName + 1, "w"))) {
      error(-1, "Couldn't run print command '%s'", fileName);
      ok = gFalse;
      return;
    }
#else
    error(-1, "Print commands are not supported ('%s')", fileName);
    ok = gFalse;
    return;
#endif
  } else {
    fileTypeA = psFile;
    if (!(f = fopen(fileName, "w"))) {
      error(-1, "Couldn't open PostScript file '%s'", fileName);
      ok = gFalse;
      return;
    }
  }

  init(outputToFile, f, fileTypeA,
       xrefA, catalog, firstPage, lastPage, modeA,
       imgLLXA, imgLLYA, imgURXA, imgURYA, manualCtrlA);
}

PSOutputDev::PSOutputDev(PSOutputFunc outputFuncA, void *outputStreamA,
			 XRef *xrefA, Catalog *catalog,
			 int firstPage, int lastPage, PSOutMode modeA,
			 int imgLLXA, int imgLLYA, int imgURXA, int imgURYA,
			 GBool manualCtrlA) {
  underlayCbk = NULL;
  underlayCbkData = NULL;
  overlayCbk = NULL;
  overlayCbkData = NULL;

  fontIDs = NULL;
  fontFileIDs = NULL;
  fontFileNames = NULL;
  font8Info = NULL;
  font16Enc = NULL;
  imgIDs = NULL;
  formIDs = NULL;
  xobjStack = NULL;
  embFontList = NULL;
  customColors = NULL;
  haveTextClip = gFalse;
  t3String = NULL;

  init(outputFuncA, outputStreamA, psGeneric,
       xrefA, catalog, firstPage, lastPage, modeA,
       imgLLXA, imgLLYA, imgURXA, imgURYA, manualCtrlA);
}

void PSOutputDev::init(PSOutputFunc outputFuncA, void *outputStreamA,
		       PSFileType fileTypeA, XRef *xrefA, Catalog *catalog,
		       int firstPage, int lastPage, PSOutMode modeA,
		       int imgLLXA, int imgLLYA, int imgURXA, int imgURYA,
		       GBool manualCtrlA) {
  Page *page;
  PDFRectangle *box;

  // initialize
  ok = gTrue;
  outputFunc = outputFuncA;
  outputStream = outputStreamA;
  fileType = fileTypeA;
  xref = xrefA;
  level = globalParams->getPSLevel();
  mode = modeA;
  paperWidth = globalParams->getPSPaperWidth();
  paperHeight = globalParams->getPSPaperHeight();
  imgLLX = imgLLXA;
  imgLLY = imgLLYA;
  imgURX = imgURXA;
  imgURY = imgURYA;
  if (imgLLX == 0 && imgURX == 0 && imgLLY == 0 && imgURY == 0) {
    globalParams->getPSImageableArea(&imgLLX, &imgLLY, &imgURX, &imgURY);
  }
  if (paperWidth < 0 || paperHeight < 0) {
    // this check is needed in case the document has zero pages
    if (firstPage > 0 && firstPage <= catalog->getNumPages()) {
      page = catalog->getPage(firstPage);
      paperWidth = (int)ceil(page->getMediaWidth());
      paperHeight = (int)ceil(page->getMediaHeight());
    } else {
      paperWidth = 1;
      paperHeight = 1;
    }
    imgLLX = imgLLY = 0;
    imgURX = paperWidth;
    imgURY = paperHeight;
  }
  preload = globalParams->getPSPreload();
  manualCtrl = manualCtrlA;
  if (mode == psModeForm) {
    lastPage = firstPage;
  }
  processColors = 0;
  inType3Char = gFalse;

#if OPI_SUPPORT
  // initialize OPI nesting levels
  opi13Nest = 0;
  opi20Nest = 0;
#endif

  tx0 = ty0 = -1;
  xScale0 = yScale0 = 0;
  rotate0 = -1;
  clipLLX0 = clipLLY0 = 0;
  clipURX0 = clipURY0 = -1;

  // initialize fontIDs, fontFileIDs, and fontFileNames lists
  fontIDSize = 64;
  fontIDLen = 0;
  fontIDs = (Ref *)gmallocn(fontIDSize, sizeof(Ref));
  fontFileIDSize = 64;
  fontFileIDLen = 0;
  fontFileIDs = (Ref *)gmallocn(fontFileIDSize, sizeof(Ref));
  fontFileNameSize = 64;
  fontFileNameLen = 0;
  fontFileNames = (GString **)gmallocn(fontFileNameSize, sizeof(GString *));
  nextTrueTypeNum = 0;
  font8InfoLen = 0;
  font8InfoSize = 0;
  font16EncLen = 0;
  font16EncSize = 0;
  imgIDLen = 0;
  imgIDSize = 0;
  formIDLen = 0;
  formIDSize = 0;

  xobjStack = new GList();
  numSaves = 0;
  numTilingPatterns = 0;
  nextFunc = 0;

  // initialize embedded font resource comment list
  embFontList = new GString();

  if (!manualCtrl) {
    // this check is needed in case the document has zero pages
    if (firstPage > 0 && firstPage <= catalog->getNumPages()) {
      writeHeader(firstPage, lastPage,
		  catalog->getPage(firstPage)->getMediaBox(),
		  catalog->getPage(firstPage)->getCropBox(),
		  catalog->getPage(firstPage)->getRotate());
    } else {
      box = new PDFRectangle(0, 0, 1, 1);
      writeHeader(firstPage, lastPage, box, box, 0);
      delete box;
    }
    if (mode != psModeForm) {
      writePS("%%BeginProlog\n");
    }
    writeXpdfProcset();
    if (mode != psModeForm) {
      writePS("%%EndProlog\n");
      writePS("%%BeginSetup\n");
    }
    writeDocSetup(catalog, firstPage, lastPage);
    if (mode != psModeForm) {
      writePS("%%EndSetup\n");
    }
  }

  // initialize sequential page number
  seqPage = 1;
}

PSOutputDev::~PSOutputDev() {
  PSOutCustomColor *cc;
  int i;

  if (ok) {
    if (!manualCtrl) {
      writePS("%%Trailer\n");
      writeTrailer();
      if (mode != psModeForm) {
	writePS("%%EOF\n");
      }
    }
    if (fileType == psFile) {
#ifdef MACOS
      ICS_MapRefNumAndAssign((short)((FILE *)outputStream)->handle);
#endif
      fclose((FILE *)outputStream);
    }
#ifdef HAVE_POPEN
    else if (fileType == psPipe) {
      pclose((FILE *)outputStream);
#ifndef WIN32
      signal(SIGPIPE, (SignalFunc)SIG_DFL);
#endif
    }
#endif
  }
  if (embFontList) {
    delete embFontList;
  }
  if (fontIDs) {
    gfree(fontIDs);
  }
  if (fontFileIDs) {
    gfree(fontFileIDs);
  }
  if (fontFileNames) {
    for (i = 0; i < fontFileNameLen; ++i) {
      delete fontFileNames[i];
    }
    gfree(fontFileNames);
  }
  if (font8Info) {
    for (i = 0; i < font8InfoLen; ++i) {
      gfree(font8Info[i].codeToGID);
    }
    gfree(font8Info);
  }
  if (font16Enc) {
    for (i = 0; i < font16EncLen; ++i) {
      delete font16Enc[i].enc;
    }
    gfree(font16Enc);
  }
  gfree(imgIDs);
  gfree(formIDs);
  if (xobjStack) {
    delete xobjStack;
  }
  while (customColors) {
    cc = customColors;
    customColors = cc->next;
    delete cc;
  }
}

void PSOutputDev::writeHeader(int firstPage, int lastPage,
			      PDFRectangle *mediaBox, PDFRectangle *cropBox,
			      int pageRotate) {
  Object info, obj1;
  double x1, y1, x2, y2;

  switch (mode) {
  case psModePS:
    writePS("%!PS-Adobe-3.0\n");
    break;
  case psModeEPS:
    writePS("%!PS-Adobe-3.0 EPSF-3.0\n");
    break;
  case psModeForm:
    writePS("%!PS-Adobe-3.0 Resource-Form\n");
    break;
  }

  writePSFmt("% Produced by xpdf/pdftops {0:s}\n", xpdfVersion);
  xref->getDocInfo(&info);
  if (info.isDict() && info.dictLookup("Creator", &obj1)->isString()) {
    writePS("%%Creator: ");
    writePSTextLine(obj1.getString());
  }
  obj1.free();
  if (info.isDict() && info.dictLookup("Title", &obj1)->isString()) {
    writePS("%%Title: ");
    writePSTextLine(obj1.getString());
  }
  obj1.free();
  info.free();
  writePSFmt("%%LanguageLevel: {0:d}\n",
	     (level == psLevel1 || level == psLevel1Sep) ? 1 :
	     (level == psLevel2 || level == psLevel2Sep) ? 2 : 3);
  if (level == psLevel1Sep || level == psLevel2Sep || level == psLevel3Sep) {
    writePS("%%DocumentProcessColors: (atend)\n");
    writePS("%%DocumentCustomColors: (atend)\n");
  }
  writePS("%%DocumentSuppliedResources: (atend)\n");

  switch (mode) {
  case psModePS:
    writePSFmt("%%DocumentMedia: plain {0:d} {1:d} 0 () ()\n",
	       paperWidth, paperHeight);
    writePSFmt("%%BoundingBox: 0 0 {0:d} {1:d}\n", paperWidth, paperHeight);
    writePSFmt("%%Pages: {0:d}\n", lastPage - firstPage + 1);
    writePS("%%EndComments\n");
    writePS("%%BeginDefaults\n");
    writePS("%%PageMedia: plain\n");
    writePS("%%EndDefaults\n");
    break;
  case psModeEPS:
    epsX1 = cropBox->x1;
    epsY1 = cropBox->y1;
    epsX2 = cropBox->x2;
    epsY2 = cropBox->y2;
    if (pageRotate == 0 || pageRotate == 180) {
      x1 = epsX1;
      y1 = epsY1;
      x2 = epsX2;
      y2 = epsY2;
    } else { // pageRotate == 90 || pageRotate == 270
      x1 = 0;
      y1 = 0;
      x2 = epsY2 - epsY1;
      y2 = epsX2 - epsX1;
    }
    writePSFmt("%%BoundingBox: {0:d} {1:d} {2:d} {3:d}\n",
	       (int)floor(x1), (int)floor(y1), (int)ceil(x2), (int)ceil(y2));
    if (floor(x1) != ceil(x1) || floor(y1) != ceil(y1) ||
	floor(x2) != ceil(x2) || floor(y2) != ceil(y2)) {
      writePSFmt("%%HiResBoundingBox: {0:.4g} {1:.4g} {2:.4g} {3:.4g}\n",
		 x1, y1, x2, y2);
    }
    writePS("%%EndComments\n");
    break;
  case psModeForm:
    writePS("%%EndComments\n");
    writePS("32 dict dup begin\n");
    writePSFmt("/BBox [{0:d} {1:d} {2:d} {3:d}] def\n",
	       (int)floor(mediaBox->x1), (int)floor(mediaBox->y1),
	       (int)ceil(mediaBox->x2), (int)ceil(mediaBox->y2));
    writePS("/FormType 1 def\n");
    writePS("/Matrix [1 0 0 1 0 0] def\n");
    break;
  }
}

void PSOutputDev::writeXpdfProcset() {
  GBool lev1, lev2, lev3, sep, nonSep;
  char **p;
  char *q;

  writePSFmt("%%BeginResource: procset xpdf {0:s} 0\n", xpdfVersion);
  writePSFmt("%%Copyright: {0:s}\n", xpdfCopyright);
  lev1 = lev2 = lev3 = sep = nonSep = gTrue;
  for (p = prolog; *p; ++p) {
    if ((*p)[0] == '~') {
      lev1 = lev2 = lev3 = sep = nonSep = gFalse;
      for (q = *p + 1; *q; ++q) {
	switch (*q) {
	case '1': lev1 = gTrue; break;
	case '2': lev2 = gTrue; break;
	case '3': lev3 = gTrue; break;
	case 's': sep = gTrue; break;
	case 'n': nonSep = gTrue; break;
	}
      }
    } else if ((level == psLevel1 && lev1 && nonSep) ||
	       (level == psLevel1Sep && lev1 && sep) ||
	       (level == psLevel2 && lev2 && nonSep) ||
	       (level == psLevel2Sep && lev2 && sep) ||
	       (level == psLevel3 && lev3 && nonSep) ||
	       (level == psLevel3Sep && lev3 && sep)) {
      writePSFmt("{0:s}\n", *p);
    }
  }
  writePS("%%EndResource\n");

  if (level >= psLevel3) {
    for (p = cmapProlog; *p; ++p) {
      writePSFmt("{0:s}\n", *p);
    }
  }
}

void PSOutputDev::writeDocSetup(Catalog *catalog,
				int firstPage, int lastPage) {
  Page *page;
  Dict *resDict;
  Annots *annots;
  Object obj1, obj2;
  int pg, i;

  if (mode == psModeForm) {
    // swap the form and xpdf dicts
    writePS("xpdf end begin dup begin\n");
  } else {
    writePS("xpdf begin\n");
  }
  for (pg = firstPage; pg <= lastPage; ++pg) {
    page = catalog->getPage(pg);
    if ((resDict = page->getResourceDict())) {
      setupResources(resDict);
    }
    annots = new Annots(xref, catalog, page->getAnnots(&obj1));
    obj1.free();
    for (i = 0; i < annots->getNumAnnots(); ++i) {
      if (annots->getAnnot(i)->getAppearance(&obj1)->isStream()) {
	obj1.streamGetDict()->lookup("Resources", &obj2);
	if (obj2.isDict()) {
	  setupResources(obj2.getDict());
	}
	obj2.free();
      }
      obj1.free();
    }
    delete annots;
  }
  if (mode != psModeForm) {
    if (mode != psModeEPS && !manualCtrl) {
      writePSFmt("{0:d} {1:d} {2:s} pdfSetup\n",
		 paperWidth, paperHeight,
		 globalParams->getPSDuplex() ? "true" : "false");
    }
#if OPI_SUPPORT
    if (globalParams->getPSOPI()) {
      writePS("/opiMatrix matrix currentmatrix def\n");
    }
#endif
  }
}

void PSOutputDev::writePageTrailer() {
  if (mode != psModeForm) {
    writePS("pdfEndPage\n");
  }
}

void PSOutputDev::writeTrailer() {
  PSOutCustomColor *cc;

  if (mode == psModeForm) {
    writePS("/Foo exch /Form defineresource pop\n");
  } else {
    writePS("end\n");
    writePS("%%DocumentSuppliedResources:\n");
    writePS(embFontList->getCString());
    if (level == psLevel1Sep || level == psLevel2Sep ||
	level == psLevel3Sep) {
      writePS("%%DocumentProcessColors:");
      if (processColors & psProcessCyan) {
	writePS(" Cyan");
	 }
      if (processColors & psProcessMagenta) {
	writePS(" Magenta");
      }
      if (processColors & psProcessYellow) {
	writePS(" Yellow");
      }
      if (processColors & psProcessBlack) {
	writePS(" Black");
      }
      writePS("\n");
      writePS("%%DocumentCustomColors:");
      for (cc = customColors; cc; cc = cc->next) {
	writePSFmt(" ({0:s})", cc->name->getCString());
      }
      writePS("\n");
      writePS("%%CMYKCustomColor:\n");
      for (cc = customColors; cc; cc = cc->next) {
	writePSFmt("%%+ {0:.4g} {1:.4g} {2:.4g} {3:.4g} ({4:t})\n",
		   cc->c, cc->m, cc->y, cc->k, cc->name);
      }