fixes issue #112446

svn path=/trunk/KDE/kdegraphics/kdvi/; revision=461082

dviFile.cpp

@@ -52,6 +52,7 @@
 
 #include <kdebug.h>
 #include <klocale.h>
+#include <ktempfile.h>
 #include <qdir.h>
 #include <qfileinfo.h>
 #include <stdlib.h>
@@ -75,6 +76,7 @@ dvifile::dvifile(const dvifile *old, fontPool *fp)
   numberOfExternalPSFiles = 0;
   numberOfExternalNONPSFiles = 0;
   sourceSpecialMarker = old->sourceSpecialMarker;
+  have_complainedAboutMissingPDF2PS = false;
 
   dviData = old->dviData.copy();
 
@@ -278,6 +280,7 @@ dvifile::dvifile(QString fname, fontPool *pool)
   numberOfExternalNONPSFiles = 0;
   font_pool    = pool;
   sourceSpecialMarker = true;
+  have_complainedAboutMissingPDF2PS = false;
 
   QFile file(fname);
   filename = file.name();
@@ -315,6 +318,13 @@ dvifile::~dvifile()
   kdDebug(4300) << "destroy dvi-file" << endl;
 #endif
 
+  // Delete converted PDF files
+  QMapIterator<QString, QString> i(convertedFiles);
+  while (i.hasNext()) {
+    i.next();
+    QFile::remove(i.value());
+  }
+
   if (suggestedPageSize != 0)
     delete suggestedPageSize;
   if (font_pool != 0)
@@ -351,6 +361,65 @@ void dvifile::renumber()
 }
 
 
+QString dvifile::convertPDFtoPS(const QString &PDFFilename, QString *converrorms)
+{
+  // Check if the PDFFile is known
+  QMap<QString, QString>::Iterator it =  convertedFiles.find(PDFFilename);
+  if (it != convertedFiles.end()) {
+    // PDF-File is known. Good.
+    return it.data();
+  }
+
+  // Get the name of a temporary file
+  KTempFile tmpfile(QString::null, ".ps");
+  QString convertedFileName = tmpfile.name();
+  tmpfile.close();
+  tmpfile.unlink();
+
+  // Use pdf2ps to do the conversion
+  KProcIO proc;
+  proc << "pdf2ps" << PDFFilename << convertedFileName;
+  if (proc.start(KProcess::Block, true) == false) {
+    convertedFiles[PDFFilename] = QString::null; // Indicates that conversion failed, won't try again.
+    if ((converrorms != 0) && (have_complainedAboutMissingPDF2PS == false)) {
+      *converrorms = i18n("<qt><p>The external program <strong>pdf2ps</strong> could not be started. As a result, "
+			  "the PDF-file %1 could not be converted to PostScript. Some graphic elements in your "
+			  "document will therefore not be displayed.</p>"
+			  "<p><b>Possible reason:</b> The program <strong>pdf2ps</strong> is perhaps not installed "
+			  "on your system, or it cannot be found in the current search path.</p>"
+			  "<p><b>What you can do:</b> The program <strong>pdf2ps</strong> program is normally "
+			  "contained in distributions of the ghostscript PostScript interpreter system. If "
+			  "ghostscipt is not installed on your system, you could install it now. " 
+			  "If you are sure that ghostscript is installed, please try to use <strong>pdf2ps</strong> "
+			  "from the command line to check if it really works.</p><p><b>PATH:</b> %2</p></qt>").arg(PDFFilename).arg(getenv("PATH"));
+      have_complainedAboutMissingPDF2PS = true;
+    }
+    return QString::null;
+  }
+  if ( !QFile::exists(convertedFileName) || !proc.normalExit() || (proc.exitStatus() != 0) ) {
+    convertedFiles[PDFFilename] = QString::null; // Indicates that conversion failed, won't try again.
+    if (converrorms != 0) {
+      QString outp, outl;
+      while(proc.readln(outl) != -1)
+	outp += outl;
+
+      *converrorms = i18n("<qt><p>The PDF-file %1 could not be converted to PostScript. Some graphic elements in your "
+			  "document will therefore not be displayed.</p>"
+			  "<p><b>Possible reason:</b> The file %1 might be broken, or might not be a PDF-file at all. "
+			  "This is the output of the <strong>pdf2ps</strong> program that KDVI used:</p>"
+			  "<p><strong>%2</strong></p></qt>").arg(PDFFilename).arg(outp);
+    }
+    return QString::null;
+  }
+  // Save name of converted file to buffer, so PDF file won't be
+  // converted again, and files can be deleted when *this is
+  // deconstructed.
+  convertedFiles[PDFFilename] = convertedFileName;
+
+  return convertedFileName;
+}
+
+
 bool dvifile::saveAs(const QString &filename)
 {
   if (dvi_Data() == 0)

dviFile.h

@@ -5,7 +5,7 @@
 // Class that represents a DVI file. Part of KDVI - A DVI previewing
 // plugin for kviewshell.
 //
-// (C) 2004 Stefan Kebekus. Distributed under the GPL.
+// (C) 2004-2005 Stefan Kebekus. Distributed under the GPL.
 //
 
 #ifndef _DVIFILE_H
@@ -18,6 +18,7 @@
 #include <qstring.h>
 //Added by qt3to4:
 #include <Q3MemArray>
+#include <qmap.h>
 
 #include "bigEndianByteReader.h"
 
@@ -99,6 +100,26 @@ class dvifile : public bigEndianByteReader
       renumbers the pages. */
   void           renumber();
 
+  /** PDF to PS file conversion
+      
+  This utility method takes the name of a PDF-file, and attempts to
+  convert it to a PS file. The dvifile internally keeps a list of
+  converted files, to do two thigs:
+  
+  - convert files only once.
+  
+  - delete all converted files on destruction
+  
+  @warning The internal buffer can lead to difficulties if filenames
+    of PDF-files are not unique: if the content of a PDF file is
+    changed and this method is called a second time with the same file
+    name, the method will then NOT convert the file, but simply return
+    the name from the buffer
+
+  @returns The name of the PS file, or QString::null on failure.
+  */
+  QString convertPDFtoPS(const QString &PDFFilename, QString *converrorms=0);
+
  private:
   /** process_preamble reads the information in the preamble and
       stores it into global variables for later use. */
@@ -118,6 +139,19 @@ class dvifile : public bigEndianByteReader
   double         cmPerDVIunit;
 
   Q3MemArray<Q_UINT8>  dviData;
+
+  /** Map of filenames for converted PDF files
+
+  This map contains names of PDF files that were converted to
+  PostScript. The key is the name of the PDF file, the data the name
+  of the associated PS file, or QString::null, if the file could not
+  be converted. The PS files are deleted when the DVI-file is
+  destructed. */
+  QMap<QString, QString> convertedFiles;
+
+  /** Flag, used so that KDVI complains only once about a missing
+      "PDF2PS" utility. Set to "false" in the constructor. */
+  bool           have_complainedAboutMissingPDF2PS;
 };
 
 #endif //ifndef _DVIFILE_H

dviRenderer_prescan.cpp

@@ -15,6 +15,7 @@
 
 #include <kdebug.h>
 #include <klocale.h>
+#include <kmessagebox.h>
 #include <kmimetype.h>
 #include <kprocess.h>
 #include <kprocio.h>
@@ -85,6 +86,10 @@ void dviRenderer::prescan_embedPS(char *cp, Q_UINT8 *beginningOfSpecialCommand)
   // Now locate the Gfx file on the hard disk...
   EPSfilename = ghostscript_interface::locateEPSfile(EPSfilename, dviFile);
 
+  // If the EPSfilename really points to a PDF file, convert that file now.
+  if (ending == "pdf")
+    EPSfilename = dviFile->convertPDFtoPS(EPSfilename);
+
   if (!QFile::exists(EPSfilename)) {
     // Find the number of the page
     Q_UINT32 currentOffset = beginningOfSpecialCommand - dviFile->dvi_Data();
@@ -92,6 +97,9 @@ void dviRenderer::prescan_embedPS(char *cp, Q_UINT8 *beginningOfSpecialCommand)
     for(page=0; page < dviFile->total_pages; page++) 
       if ((dviFile->page_offset[page] <= currentOffset) && (currentOffset <= dviFile->page_offset[page+1]))
 	break;
+    if (ending == "pdf") 
+      errorMsg += i18n("Page %1: The PDF file <strong>%2</strong> could not be converted to PostScript.<br>").arg(page+1).arg(originalFName);
+    else
       errorMsg += i18n("Page %1: The PostScript file <strong>%2</strong> could not be found.<br>").arg(page+1).arg(originalFName);
     embedPS_progress->progressBar()->advance(1);
     qApp->processEvents();
@@ -409,6 +417,22 @@ void dviRenderer::prescan_ParsePSFileSpecial(QString cp)
   // Now locate the Gfx file on the hard disk...
   EPSfilename = ghostscript_interface::locateEPSfile(EPSfilename, dviFile);
 
+  // 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...").arg(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>").arg(oEPSfilename),
+				 convErrorMsg, i18n("PDF/PS conversion error"));
+      return;
+    }
+  }
+  
   // Now parse the arguments. 
   int  llx     = 0; 
   int  lly     = 0;