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341 lines
11 KiB
341 lines
11 KiB
//
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// ghostscript_interface
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//
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// Part of KDVI - A framework for multipage text/gfx viewers
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//
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// (C) 2004 Stefan Kebekus
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// Distributed under the GPL
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#include <config.h>
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#include <kdebug.h>
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#include <klocale.h>
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#include <kmessagebox.h>
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#include <kprocio.h>
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#include <ktempfile.h>
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#include <kurl.h>
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#include <tqdir.h>
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#include <tqpainter.h>
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#include "psgs.h"
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#include "dviFile.h"
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#include "pageNumber.h"
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extern const char psheader[];
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//#define DEBUG_PSGS
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pageInfo::pageInfo(const TQString& _PostScriptString) {
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PostScriptString = new TQString(_PostScriptString);
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background = TQt::white;
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permanentBackground = TQt::white;
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}
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pageInfo::~pageInfo() {
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if (PostScriptString != 0L)
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delete PostScriptString;
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}
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// ======================================================
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ghostscript_interface::ghostscript_interface() {
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pageList.setAutoDelete(true);
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PostScriptHeaderString = new TQString();
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knownDevices.append("png256");
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knownDevices.append("jpeg");
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knownDevices.append("pnn");
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knownDevices.append("pnnraw");
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gsDevice = knownDevices.begin();
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}
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ghostscript_interface::~ghostscript_interface() {
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if (PostScriptHeaderString != 0L)
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delete PostScriptHeaderString;
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}
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void ghostscript_interface::setPostScript(const PageNumber& page, const TQString& PostScript) {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::setPostScript( " << page << ", ... )" << endl;
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#endif
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if (pageList.find(page) == 0) {
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pageInfo *info = new pageInfo(PostScript);
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// Check if dict is big enough
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if (pageList.count() > pageList.size() -2)
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pageList.resize(pageList.size()*2);
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pageList.insert(page, info);
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} else
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*(pageList.find(page)->PostScriptString) = PostScript;
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}
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void ghostscript_interface::setIncludePath(const TQString &_includePath) {
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if (_includePath.isEmpty())
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includePath = "*"; // Allow all files
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else
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includePath = _includePath+"/*";
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}
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void ghostscript_interface::setBackgroundColor(const PageNumber& page, const TQColor& background_color, bool permanent) {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::setBackgroundColor( " << page << ", " << background_color << " )" << endl;
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#endif
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if (pageList.find(page) == 0) {
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pageInfo *info = new pageInfo(TQString());
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info->background = background_color;
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if (permanent)
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info->permanentBackground = background_color;
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// Check if dict is big enough
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if (pageList.count() > pageList.size() -2)
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pageList.resize(pageList.size()*2);
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pageList.insert(page, info);
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} else {
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pageList.find(page)->background = background_color;
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if (permanent)
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pageList.find(page)->permanentBackground = background_color;
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}
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}
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void ghostscript_interface::restoreBackgroundColor(const PageNumber& page)
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{
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::restoreBackgroundColor( " << page << " )" << endl;
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#endif
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if (pageList.find(page) == 0)
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return;
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pageInfo *info = pageList.find(page);
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info->background = info->permanentBackground;
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}
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// Returns the background color for a certain page. This color is
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// always guaranteed to be valid
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TQColor ghostscript_interface::getBackgroundColor(const PageNumber& page) const {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::getBackgroundColor( " << page << " )" << endl;
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#endif
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if (pageList.find(page) == 0)
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return TQt::white;
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else
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return pageList.find(page)->background;
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}
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void ghostscript_interface::clear() {
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PostScriptHeaderString->truncate(0);
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// Deletes all items, removes temporary files, etc.
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pageList.clear();
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}
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void ghostscript_interface::gs_generate_graphics_file(const PageNumber& page, const TQString& filename, long magnification) {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::gs_generate_graphics_file( " << page << ", " << filename << " )" << endl;
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#endif
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if (knownDevices.isEmpty()) {
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kdError(4300) << "No known devices found" << endl;
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return;
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}
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emit(setStatusBarText(i18n("Generating PostScript graphics...")));
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pageInfo *info = pageList.find(page);
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// Generate a PNG-file
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// Step 1: Write the PostScriptString to a File
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KTempFile PSfile(TQString(),".ps");
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TQTextStream& os = *PSfile.textStream();
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os << "%!PS-Adobe-2.0\n"
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<< "%%Creator: kdvi\n"
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<< "%%Title: KDVI temporary PostScript\n"
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<< "%%Pages: 1\n"
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<< "%%PageOrder: Ascend\n"
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// HSize and VSize in 1/72 inch
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<< "%%BoundingBox: 0 0 "
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<< (TQ_INT32)(72*(pixel_page_w/resolution)) << ' '
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<< (TQ_INT32)(72*(pixel_page_h/resolution)) << '\n'
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<< "%%EndComments\n"
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<< "%!\n"
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<< psheader
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<< "TeXDict begin "
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// HSize in (1/(65781.76*72))inch
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<< (TQ_INT32)(72*65781*(pixel_page_w/resolution)) << ' '
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// VSize in (1/(65781.76*72))inch
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<< (TQ_INT32)(72*65781*(pixel_page_h/resolution)) << ' '
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// Magnification
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<< (TQ_INT32)(magnification)
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// dpi and vdpi
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<< " 300 300"
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// Name
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<< " (test.dvi)"
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<< " @start end\n"
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<< "TeXDict begin\n"
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// Start page
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<< "1 0 bop 0 0 a \n";
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if (PostScriptHeaderString->latin1() != NULL)
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os << PostScriptHeaderString->latin1();
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if (info->background != TQt::white) {
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TQString colorCommand = TQString("gsave %1 %2 %3 setrgbcolor clippath fill grestore\n").
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arg(info->background.red()/255.0).
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arg(info->background.green()/255.0).
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arg(info->background.blue()/255.0);
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os << colorCommand.latin1();
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}
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if (info->PostScriptString->latin1() != NULL)
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os << info->PostScriptString->latin1();
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os << "end\n"
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<< "showpage \n";
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PSfile.close();
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// Step 2: Call GS with the File
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TQFile::remove(filename.ascii());
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KProcIO proc;
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TQStringList argus;
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argus << "gs";
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argus << "-dSAFER" << "-dPARANOIDSAFER" << "-dDELAYSAFER" << "-dNOPAUSE" << "-dBATCH";
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argus << TQString("-sDEVICE=%1").arg(*gsDevice);
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argus << TQString("-sOutputFile=%1").arg(filename);
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argus << TQString("-sExtraIncludePath=%1").arg(includePath);
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argus << TQString("-g%1x%2").arg(pixel_page_w).arg(pixel_page_h); // page size in pixels
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argus << TQString("-r%1").arg(resolution); // resolution in dpi
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argus << "-c" << "<< /PermitFileReading [ ExtraIncludePath ] /PermitFileWriting [] /PermitFileControl [] >> setuserparams .locksafe";
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argus << "-f" << PSfile.name();
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#ifdef DEBUG_PSGS
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kdDebug(4300) << argus.join(" ") << endl;
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#endif
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proc << argus;
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if (proc.start(KProcess::Block) == false) {
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// Starting ghostscript did not work.
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// TODO: Issue error message, switch PS support off.
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kdError(4300) << "ghostview could not be started" << endl;
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}
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PSfile.unlink();
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// Check if gs has indeed produced a file.
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if (TQFile::exists(filename) == false) {
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kdError(4300) << "GS did not produce output." << endl;
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// No. Check is the reason is that the device is not compiled into
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// ghostscript. If so, try again with another device.
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TQString GSoutput;
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while(proc.readln(GSoutput) != -1) {
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if (GSoutput.contains("Unknown device")) {
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kdDebug(4300) << TQString("The version of ghostview installed on this computer does not support "
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"the '%1' ghostview device driver.").arg(*gsDevice) << endl;
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knownDevices.remove(gsDevice);
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gsDevice = knownDevices.begin();
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if (knownDevices.isEmpty())
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// TODO: show a requestor of some sort.
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KMessageBox::detailedError(0,
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i18n("<qt>The version of Ghostview that is installed on this computer does not contain "
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"any of the Ghostview device drivers that are known to KDVI. PostScript "
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"support has therefore been turned off in KDVI.</qt>"),
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i18n("<qt><p>The Ghostview program, which KDVI uses internally to display the "
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"PostScript graphics that is included in this DVI file, is generally able to "
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"write its output in a variety of formats. The sub-programs that Ghostview uses "
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"for these tasks are called 'device drivers'; there is one device driver for "
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"each format that Ghostview is able to write. Different versions of Ghostview "
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"often have different sets of device drivers available. It seems that the "
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"version of Ghostview that is installed on this computer does not contain "
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"<strong>any</strong> of the device drivers that are known to KDVI.</p>"
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"<p>It seems unlikely that a regular installation of Ghostview would not contain "
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"these drivers. This error may therefore point to a serious misconfiguration of "
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"the Ghostview installation on your computer.</p>"
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"<p>If you want to fix the problems with Ghostview, you can use the command "
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"<strong>gs --help</strong> to display the list of device drivers contained in "
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"Ghostview. Among others, KDVI can use the 'png256', 'jpeg' and 'pnm' "
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"drivers. Note that KDVI needs to be restarted to re-enable PostScript support."
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"</p></qt>"));
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else {
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kdDebug(4300) << TQString("KDVI will now try to use the '%1' device driver.").arg(*gsDevice) << endl;
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gs_generate_graphics_file(page, filename, magnification);
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}
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return;
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}
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}
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}
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emit(setStatusBarText(TQString()));
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}
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void ghostscript_interface::graphics(const PageNumber& page, double dpi, long magnification, TQPainter* paint) {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "ghostscript_interface::graphics( " << page << ", " << dpi << ", ... ) called." << endl;
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#endif
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if (paint == 0) {
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kdError(4300) << "ghostscript_interface::graphics(PageNumber page, double dpi, long magnification, TQPainter *paint) called with paint == 0" << endl;
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return;
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}
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resolution = dpi;
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pixel_page_w = paint->viewport().width();
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pixel_page_h = paint->viewport().height();
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pageInfo *info = pageList.find(page);
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// No PostScript? Then return immediately.
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if ((info == 0) || (info->PostScriptString->isEmpty())) {
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#ifdef DEBUG_PSGS
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kdDebug(4300) << "No PostScript found. Not drawing anything." << endl;
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#endif
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return;
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}
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KTempFile gfxFile(TQString(), ".png");
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gfxFile.setAutoDelete(1);
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gfxFile.close(); // we are want the filename, not the file
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gs_generate_graphics_file(page, gfxFile.name(), magnification);
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TQPixmap MemoryCopy(gfxFile.name());
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paint->drawPixmap(0, 0, MemoryCopy);
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return;
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}
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TQString ghostscript_interface::locateEPSfile(const TQString &filename, const KURL &base)
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{
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// If the base URL indicates that the DVI file is local, try to find
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// the graphics file in the directory where the DVI file resides
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if (base.isLocalFile()) {
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TQString path = base.path(); // -> "/bar/foo.dvi"
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TQFileInfo fi1(path);
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TQFileInfo fi2(fi1.dir(),filename);
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if (fi2.exists())
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return fi2.absFilePath();
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}
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// Otherwise, use kpsewhich to find the eps file.
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TQString EPSfilename;
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KProcIO proc;
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proc << "kpsewhich" << filename;
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proc.start(KProcess::Block);
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proc.readln(EPSfilename);
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return EPSfilename.stripWhiteSpace();
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}
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#include "psgs.moc"
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