// // ghostscript_interface // // Part of KDVI - A framework for multipage text/gfx viewers // // (C) 2004 Stefan Kebekus // Distributed under the GPL #include #include #include #include #include #include #include #include #include #include "psgs.h" #include "dviFile.h" #include "pageNumber.h" extern const char psheader[]; //#define DEBUG_PSGS pageInfo::pageInfo(const TQString& _PostScriptString) { PostScriptString = new TQString(_PostScriptString); background = TQt::white; permanentBackground = TQt::white; } pageInfo::~pageInfo() { if (PostScriptString != 0L) delete PostScriptString; } // ====================================================== ghostscript_interface::ghostscript_interface() { pageList.setAutoDelete(true); PostScriptHeaderString = new TQString(); knownDevices.append("png256"); knownDevices.append("jpeg"); knownDevices.append("pnn"); knownDevices.append("pnnraw"); gsDevice = knownDevices.begin(); } ghostscript_interface::~ghostscript_interface() { if (PostScriptHeaderString != 0L) delete PostScriptHeaderString; } void ghostscript_interface::setPostScript(const PageNumber& page, const TQString& PostScript) { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::setPostScript( " << page << ", ... )" << endl; #endif if (pageList.find(page) == 0) { pageInfo *info = new pageInfo(PostScript); // Check if dict is big enough if (pageList.count() > pageList.size() -2) pageList.resize(pageList.size()*2); pageList.insert(page, info); } else *(pageList.find(page)->PostScriptString) = PostScript; } void ghostscript_interface::setIncludePath(const TQString &_includePath) { if (_includePath.isEmpty()) includePath = "*"; // Allow all files else includePath = _includePath+"/*"; } void ghostscript_interface::setBackgroundColor(const PageNumber& page, const TQColor& background_color, bool permanent) { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::setBackgroundColor( " << page << ", " << background_color << " )" << endl; #endif if (pageList.find(page) == 0) { pageInfo *info = new pageInfo(TQString()); info->background = background_color; if (permanent) info->permanentBackground = background_color; // Check if dict is big enough if (pageList.count() > pageList.size() -2) pageList.resize(pageList.size()*2); pageList.insert(page, info); } else { pageList.find(page)->background = background_color; if (permanent) pageList.find(page)->permanentBackground = background_color; } } void ghostscript_interface::restoreBackgroundColor(const PageNumber& page) { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::restoreBackgroundColor( " << page << " )" << endl; #endif if (pageList.find(page) == 0) return; pageInfo *info = pageList.find(page); info->background = info->permanentBackground; } // Returns the background color for a certain page. This color is // always guaranteed to be valid TQColor ghostscript_interface::getBackgroundColor(const PageNumber& page) const { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::getBackgroundColor( " << page << " )" << endl; #endif if (pageList.find(page) == 0) return TQt::white; else return pageList.find(page)->background; } void ghostscript_interface::clear() { PostScriptHeaderString->truncate(0); // Deletes all items, removes temporary files, etc. pageList.clear(); } void ghostscript_interface::gs_generate_graphics_file(const PageNumber& page, const TQString& filename, long magnification) { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::gs_generate_graphics_file( " << page << ", " << filename << " )" << endl; #endif if (knownDevices.isEmpty()) { kdError(4300) << "No known devices found" << endl; return; } emit(setStatusBarText(i18n("Generating PostScript graphics..."))); pageInfo *info = pageList.find(page); // Generate a PNG-file // Step 1: Write the PostScriptString to a File KTempFile PSfile(TQString(),".ps"); TQTextStream& os = *PSfile.textStream(); os << "%!PS-Adobe-2.0\n" << "%%Creator: kdvi\n" << "%%Title: KDVI temporary PostScript\n" << "%%Pages: 1\n" << "%%PageOrder: Ascend\n" // HSize and VSize in 1/72 inch << "%%BoundingBox: 0 0 " << (TQ_INT32)(72*(pixel_page_w/resolution)) << ' ' << (TQ_INT32)(72*(pixel_page_h/resolution)) << '\n' << "%%EndComments\n" << "%!\n" << psheader << "TeXDict begin " // HSize in (1/(65781.76*72))inch << (TQ_INT32)(72*65781*(pixel_page_w/resolution)) << ' ' // VSize in (1/(65781.76*72))inch << (TQ_INT32)(72*65781*(pixel_page_h/resolution)) << ' ' // Magnification << (TQ_INT32)(magnification) // dpi and vdpi << " 300 300" // Name << " (test.dvi)" << " @start end\n" << "TeXDict begin\n" // Start page << "1 0 bop 0 0 a \n"; if (PostScriptHeaderString->latin1() != NULL) os << PostScriptHeaderString->latin1(); if (info->background != TQt::white) { TQString colorCommand = TQString("gsave %1 %2 %3 setrgbcolor clippath fill grestore\n"). arg(info->background.red()/255.0). arg(info->background.green()/255.0). arg(info->background.blue()/255.0); os << colorCommand.latin1(); } if (info->PostScriptString->latin1() != NULL) os << info->PostScriptString->latin1(); os << "end\n" << "showpage \n"; PSfile.close(); // Step 2: Call GS with the File TQFile::remove(filename.ascii()); KProcIO proc; TQStringList argus; argus << "gs"; argus << "-dSAFER" << "-dPARANOIDSAFER" << "-dDELAYSAFER" << "-dNOPAUSE" << "-dBATCH"; argus << TQString("-sDEVICE=%1").tqarg(*gsDevice); argus << TQString("-sOutputFile=%1").tqarg(filename); argus << TQString("-sExtraIncludePath=%1").tqarg(includePath); argus << TQString("-g%1x%2").tqarg(pixel_page_w).tqarg(pixel_page_h); // page size in pixels argus << TQString("-r%1").tqarg(resolution); // resolution in dpi argus << "-c" << "<< /PermitFileReading [ ExtraIncludePath ] /PermitFileWriting [] /PermitFileControl [] >> setuserparams .locksafe"; argus << "-f" << PSfile.name(); #ifdef DEBUG_PSGS kdDebug(4300) << argus.join(" ") << endl; #endif proc << argus; if (proc.start(KProcess::Block) == false) { // Starting ghostscript did not work. // TODO: Issue error message, switch PS support off. kdError(4300) << "ghostview could not be started" << endl; } PSfile.unlink(); // Check if gs has indeed produced a file. if (TQFile::exists(filename) == false) { kdError(4300) << "GS did not produce output." << endl; // No. Check is the reason is that the device is not compiled into // ghostscript. If so, try again with another device. TQString GSoutput; while(proc.readln(GSoutput) != -1) { if (GSoutput.contains("Unknown device")) { kdDebug(4300) << TQString("The version of ghostview installed on this computer does not support " "the '%1' ghostview device driver.").tqarg(*gsDevice) << endl; knownDevices.remove(gsDevice); gsDevice = knownDevices.begin(); if (knownDevices.isEmpty()) // TODO: show a requestor of some sort. KMessageBox::detailedError(0, i18n("The version of Ghostview that is installed on this computer does not contain " "any of the Ghostview device drivers that are known to KDVI. PostScript " "support has therefore been turned off in KDVI."), i18n("

The Ghostview program, which KDVI uses internally to display the " "PostScript graphics that is included in this DVI file, is generally able to " "write its output in a variety of formats. The sub-programs that Ghostview uses " "for these tasks are called 'device drivers'; there is one device driver for " "each format that Ghostview is able to write. Different versions of Ghostview " "often have different sets of device drivers available. It seems that the " "version of Ghostview that is installed on this computer does not contain " "any of the device drivers that are known to KDVI.

" "

It seems unlikely that a regular installation of Ghostview would not contain " "these drivers. This error may therefore point to a serious misconfiguration of " "the Ghostview installation on your computer.

" "

If you want to fix the problems with Ghostview, you can use the command " "gs --help to display the list of device drivers contained in " "Ghostview. Among others, KDVI can use the 'png256', 'jpeg' and 'pnm' " "drivers. Note that KDVI needs to be restarted to re-enable PostScript support." "

")); else { kdDebug(4300) << TQString("KDVI will now try to use the '%1' device driver.").tqarg(*gsDevice) << endl; gs_generate_graphics_file(page, filename, magnification); } return; } } } emit(setStatusBarText(TQString())); } void ghostscript_interface::graphics(const PageNumber& page, double dpi, long magnification, TQPainter* paint) { #ifdef DEBUG_PSGS kdDebug(4300) << "ghostscript_interface::graphics( " << page << ", " << dpi << ", ... ) called." << endl; #endif if (paint == 0) { kdError(4300) << "ghostscript_interface::graphics(PageNumber page, double dpi, long magnification, TQPainter *paint) called with paint == 0" << endl; return; } resolution = dpi; pixel_page_w = paint->viewport().width(); pixel_page_h = paint->viewport().height(); pageInfo *info = pageList.find(page); // No PostScript? Then return immediately. if ((info == 0) || (info->PostScriptString->isEmpty())) { #ifdef DEBUG_PSGS kdDebug(4300) << "No PostScript found. Not drawing anything." << endl; #endif return; } KTempFile gfxFile(TQString(), ".png"); gfxFile.setAutoDelete(1); gfxFile.close(); // we are want the filename, not the file gs_generate_graphics_file(page, gfxFile.name(), magnification); TQPixmap MemoryCopy(gfxFile.name()); paint->drawPixmap(0, 0, MemoryCopy); return; } TQString ghostscript_interface::locateEPSfile(const TQString &filename, const KURL &base) { // If the base URL indicates that the DVI file is local, try to find // the graphics file in the directory where the DVI file resides if (base.isLocalFile()) { TQString path = base.path(); // -> "/bar/foo.dvi" TQFileInfo fi1(path); TQFileInfo fi2(fi1.dir(),filename); if (fi2.exists()) return fi2.absFilePath(); } // Otherwise, use kpsewhich to find the eps file. TQString EPSfilename; KProcIO proc; proc << "kpsewhich" << filename; proc.start(KProcess::Block); proc.readln(EPSfilename); return EPSfilename.stripWhiteSpace(); } #include "psgs.moc"