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531 lines
14 KiB
531 lines
14 KiB
/**
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* Copyright (C) 2000-2003 the KGhostView authors. See file AUTHORS.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "kpswidget.h"
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#include <stdlib.h>
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#include <math.h>
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#include <qstringlist.h>
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#include <kapplication.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 <kprocess.h>
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#include "configuration.h"
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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int handler( Display* d, XErrorEvent* e )
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{
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char msg[80], req[80], number[80];
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XGetErrorText( d, e->error_code, msg, sizeof( msg ) );
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sprintf( number, "%d", e->request_code );
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XGetErrorDatabaseText( d, "XRequest", number, "<unknown>",
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req, sizeof( req ) );
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return 0;
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}
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int orientation2angle( CDSC_ORIENTATION_ENUM orientation )
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{
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Q_ASSERT( orientation != CDSC_ORIENT_UNKNOWN );
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int angle = 0;
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switch( orientation )
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{
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case CDSC_ORIENT_UNKNOWN: break; // Catched by Q_ASSERT
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case CDSC_PORTRAIT: angle = 0; break;
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case CDSC_LANDSCAPE: angle = 90; break;
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case CDSC_UPSIDEDOWN: angle = 180; break;
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case CDSC_SEASCAPE: angle = 270; break;
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}
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return angle;
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}
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QCString palette2String( Configuration::EnumPalette::type palette )
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{
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QCString str;
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switch( palette )
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{
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case Configuration::EnumPalette::Color: str = "Color"; break;
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case Configuration::EnumPalette::Grayscale: str = "Grayscale"; break;
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case Configuration::EnumPalette::Monochrome: str = "Monochrome"; break;
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default: kdWarning( 4500 ) << "palette2String(): unkown palette" << endl;
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str = "Color";
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}
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return str;
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}
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KPSWidget::KPSWidget( QWidget* parent, const char* name ) :
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QWidget ( parent, name ),
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_gsWindow ( None ),
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_usePipe ( false ),
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_doubleBuffer ( false ),
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_ghostscriptDirty ( false ),
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_orientation ( CDSC_PORTRAIT ),
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_magnification ( 1 ),
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_palette ( Configuration::EnumPalette::Color ),
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_widgetDirty ( true ),
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_process ( 0 ),
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_buffer ( 0 ),
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_stdinReady ( false ),
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_interpreterBusy ( false ),
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_interpreterReady ( false )
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{
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XSetErrorHandler( handler );
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// Create the Atoms used to communicate with Ghostscript.
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const char* const atomNames[] = { "GHOSTVIEW", "GHOSTVIEW_COLORS",
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"NEXT", "PAGE", "DONE" };
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XInternAtoms( x11Display(), const_cast<char**>( atomNames ),
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5, false, _atoms );
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// readSettings() TODO
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}
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KPSWidget::~KPSWidget()
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{
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if ( _buffer ) operator delete( _buffer );
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stopInterpreter();
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}
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bool KPSWidget::isInterpreterReady() const
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{
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return isInterpreterRunning() && _interpreterReady;
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}
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bool KPSWidget::isInterpreterBusy() const
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{
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return _interpreterBusy;
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}
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bool KPSWidget::isInterpreterRunning() const
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{
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return ( _process && _process->isRunning() );
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}
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bool KPSWidget::nextPage()
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{
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if( !isInterpreterReady() )
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return false;
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if( _gsWindow == None ) {
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kdDebug(4500) << "communication window unknown!" << endl;
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return false;
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}
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_interpreterReady = false;
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_interpreterBusy = true;
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setCursor( waitCursor );
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XEvent e;
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e.xclient.type = ClientMessage;
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e.xclient.display = x11Display();
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e.xclient.window = _gsWindow;
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e.xclient.message_type = _atoms[NEXT];
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e.xclient.format = 32;
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XSendEvent( x11Display(), _gsWindow, false, 0, &e );
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XFlush( x11Display() );
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return true;
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}
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void KPSWidget::clear()
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{
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//_backgroundPixmap.fill();
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}
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bool KPSWidget::sendPS( FILE* fp, unsigned int begin, unsigned int end )
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{
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kdDebug(4500) << "KPSWidget::sendPS" << endl;
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if( !isInterpreterRunning() )
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return false;
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// Create a new record to add to the queue.
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_inputQueue.push( Record( fp, begin, end - begin ) );
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// Start processing the queue.
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if( _stdinReady )
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gs_input(_process);
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return true;
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}
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void KPSWidget::setGhostscriptPath( const QString& path )
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{
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kdDebug() << "KPSWidget::setGhostscriptPath( " << path << " )" << endl;
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if( _ghostscriptPath != path )
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{
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_ghostscriptPath = path;
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stopInterpreter();
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_ghostscriptDirty = true;
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}
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}
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void KPSWidget::setGhostscriptArguments( const QStringList& arguments )
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{
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if( _ghostscriptArguments != arguments )
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{
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_ghostscriptArguments = arguments;
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stopInterpreter();
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_ghostscriptDirty = true;
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}
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}
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void KPSWidget::setFileName( const QString& fileName, bool usePipe )
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{
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if(( _fileName != fileName ) || (_usePipe != usePipe))
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{
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_usePipe = usePipe;
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_fileName = fileName;
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stopInterpreter();
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_ghostscriptDirty = true;
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}
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}
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void KPSWidget::setOrientation( CDSC_ORIENTATION_ENUM orientation )
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{
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if( _orientation != orientation )
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{
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_orientation = orientation;
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stopInterpreter();
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_widgetDirty = true;
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}
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}
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void KPSWidget::setBoundingBox( const KDSCBBOX& boundingBox )
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{
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if( _boundingBox != boundingBox )
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{
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_boundingBox = boundingBox;
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stopInterpreter();
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_widgetDirty = true;
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}
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}
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void KPSWidget::setMagnification( double magnification )
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{
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if( kAbs( magnification - _magnification ) > 0.0001 )
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{
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_magnification = magnification;
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stopInterpreter();
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_widgetDirty = true;
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}
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}
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void KPSWidget::setPalette( Configuration::EnumPalette::type palette )
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{
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if( _palette != palette )
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{
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_palette = palette;
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stopInterpreter();
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_widgetDirty = true;
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}
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}
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void KPSWidget::setDoubleBuffering( bool db )
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{
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if( _doubleBuffer != db )
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{
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_doubleBuffer = db;
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stopInterpreter();
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_widgetDirty = true;
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}
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}
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namespace {
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/* Rounding up is better than normal rounding because it is better to have a pixel too many than one too little.
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* If we have one too many, no one will notice. If we have one too little, gs complains.
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*
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* I have a file which isn't displayed (gs error) without this fix.
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*/
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inline int round_up( double x )
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{
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return static_cast<int>( ceil( x ) );
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}
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}
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void KPSWidget::setupWidget()
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{
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if( !_widgetDirty )
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return;
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Q_ASSERT( orientation() != CDSC_ORIENT_UNKNOWN );
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const float dpiX = _magnification * x11AppDpiX();
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const float dpiY = _magnification * x11AppDpiY();
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int newWidth = 0, newHeight = 0;
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if( orientation() == CDSC_PORTRAIT || orientation() == CDSC_UPSIDEDOWN )
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{
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newWidth = round_up( boundingBox().width() * dpiX / 72.0 );
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newHeight = round_up( boundingBox().height() * dpiY / 72.0 );
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}
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else
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{
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newWidth = round_up( boundingBox().height() * dpiX / 72.0 );
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newHeight = round_up( boundingBox().width() * dpiY / 72.0 );
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}
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if( newWidth != width() || newHeight != height() )
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{
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setEraseColor( white );
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setFixedSize( newWidth, newHeight );
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kapp->processEvents();
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_backgroundPixmap.resize( size() );
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_backgroundPixmap.fill( white );
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// The line below is needed to work around certain "features" of styles such as liquid
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// see bug:61711 for more info (LPC, 20 Aug '03)
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setBackgroundOrigin( QWidget::WidgetOrigin );
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setErasePixmap( _backgroundPixmap );
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}
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char data[512];
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sprintf( data, "%ld %d %d %d %d %d %g %g",
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( _doubleBuffer ? 0 : _backgroundPixmap.handle() ),
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orientation2angle( orientation() ),
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boundingBox().llx(), boundingBox().lly(),
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boundingBox().urx(), boundingBox().ury(),
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dpiX, dpiY );
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XChangeProperty( x11Display(), winId(),
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_atoms[GHOSTVIEW],
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XA_STRING, 8, PropModeReplace,
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(unsigned char*) data, strlen( data ) );
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sprintf( data, "%s %d %d",
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palette2String( _palette ).data(),
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(int)BlackPixel( x11Display(), DefaultScreen( x11Display() ) ),
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(int)WhitePixel( x11Display(), DefaultScreen( x11Display() ) ) );
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XChangeProperty( x11Display(), winId(),
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_atoms[GHOSTVIEW_COLORS],
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XA_STRING, 8, PropModeReplace,
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(unsigned char*) data, strlen( data ) );
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// Make sure the properties are updated immediately.
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XSync( x11Display(), false );
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repaint();
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_widgetDirty = false;
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}
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bool KPSWidget::startInterpreter()
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{
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setupWidget();
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_process = new KProcess;
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if ( _doubleBuffer ) _process->setEnvironment( "GHOSTVIEW", QString( "%1 %2" ).arg( winId() ).arg( _backgroundPixmap.handle() ) );
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else _process->setEnvironment( "GHOSTVIEW", QString::number( winId() ) );
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*_process << _ghostscriptPath.local8Bit();
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*_process << _ghostscriptArguments;
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if( _usePipe )
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*_process <<
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// The following two lines are their to ensure that we are allowed to read _fileName
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"-dDELAYSAFER" << "-sInputFile="+_fileName << "-c" <<
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"<< /PermitFileReading [ InputFile ] /PermitFileWriting [] /PermitFileControl [] >> setuserparams .locksafe" <<
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"-";
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else
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*_process << _fileName << "-c" << "quit";
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connect( _process, SIGNAL( processExited( KProcess* ) ),
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this, SLOT( slotProcessExited( KProcess* ) ) );
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connect( _process, SIGNAL( receivedStdout( KProcess*, char*, int ) ),
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this, SLOT( gs_output( KProcess*, char*, int ) ) );
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connect( _process, SIGNAL( receivedStderr( KProcess*, char*, int ) ),
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this, SLOT( gs_output( KProcess*, char*, int ) ) );
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connect( _process, SIGNAL( wroteStdin( KProcess*) ),
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this, SLOT( gs_input( KProcess* ) ) );
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kapp->flushX();
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// Finally fire up the interpreter.
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kdDebug(4500) << "KPSWidget: starting interpreter" << endl;
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if( _process->start( KProcess::NotifyOnExit,
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_usePipe ? KProcess::All : KProcess::AllOutput ) )
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{
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_interpreterBusy = true;
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setCursor( waitCursor );
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_stdinReady = true;
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_interpreterReady = false;
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_ghostscriptDirty = false;
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return true;
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}
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else
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{
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KMessageBox::error( this,
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i18n( "Could not start Ghostscript. This is most likely "
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"caused by an incorrectly specified interpreter." ) );
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return false;
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}
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}
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void KPSWidget::stopInterpreter()
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{
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kdDebug(4500) << "KPSWidget::stopInterpreter()" << endl;
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// if( !_interpreterBusy ) return;
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if( isInterpreterRunning() )
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_process->kill( SIGHUP );
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_process = 0;
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while ( !_inputQueue.empty() ) _inputQueue.pop();
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_interpreterBusy = false;
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unsetCursor();
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}
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void KPSWidget::interpreterFailed()
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{
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stopInterpreter();
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}
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void KPSWidget::slotProcessExited( KProcess* process )
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{
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kdDebug(4500) << "KPSWidget: process exited" << endl;
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if ( process == _process )
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{
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kdDebug( 4500 ) << "KPSWidget::slotProcessExited(): looks like it was not a clean exit." << endl;
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if ( process->normalExit() ) {
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emit ghostscriptError( QString( i18n( "Exited with error code %1." ).arg( process->exitStatus() ) ) );
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} else {
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emit ghostscriptError( QString( i18n( "Process killed or crashed." ) ) );
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}
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_process = 0;
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stopInterpreter();
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unsetCursor();
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}
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}
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void KPSWidget::gs_output( KProcess*, char* buffer, int len )
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{
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emit output( buffer, len );
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}
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void KPSWidget::gs_input( KProcess* process )
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{
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kdDebug(4500) << "KPSWidget::gs_input" << endl;
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if (process != _process)
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{
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kdDebug(4500) << "KPSWidget::gs_input(): process != _process" << endl;
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return;
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}
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_stdinReady = true;
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while( ! _inputQueue.empty() && _inputQueue.front().len == 0 ) _inputQueue.pop();
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if( _inputQueue.empty() ) {
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_interpreterReady = true;
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return;
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}
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Record& current = _inputQueue.front();
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if ( fseek( current.fp, current.begin, SEEK_SET ) ) {
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kdDebug(4500) << "KPSWidget::gs_input(): seek failed!" << endl;
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interpreterFailed();
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return;
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}
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Q_ASSERT( current.len > 0 );
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const unsigned buffer_size = 4096;
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if ( !_buffer ) _buffer = static_cast<char*>( operator new( buffer_size ) );
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const int bytesRead = fread( _buffer, sizeof (char),
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QMIN( buffer_size, current.len ),
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current.fp );
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if( bytesRead > 0 )
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{
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current.begin += bytesRead;
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current.len -= bytesRead;
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if( process && process->writeStdin( _buffer, bytesRead ) )
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_stdinReady = false;
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else
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interpreterFailed();
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}
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else
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interpreterFailed();
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}
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void KPSWidget::readSettings()
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{
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setGhostscriptPath( Configuration::interpreter() );
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QStringList arguments;
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if( Configuration::antialiasing() )
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arguments = QStringList::split( " ", Configuration::antialiasingArguments() );
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else
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arguments = QStringList::split( " ", Configuration::nonAntialiasingArguments() );
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if( !Configuration::platformFonts() )
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arguments << "-dNOPLATFONTS";
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arguments << "-dNOPAUSE" << "-dQUIET" << "-dSAFER" << "-dPARANOIDSAFER";
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setGhostscriptArguments( arguments );
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setPalette( static_cast<Configuration::EnumPalette::type>( Configuration::palette() ) );
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}
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bool KPSWidget::x11Event( XEvent* e )
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{
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if( e->type == ClientMessage )
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{
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_gsWindow = e->xclient.data.l[0];
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if( e->xclient.message_type == _atoms[PAGE] )
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{
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kdDebug(4500) << "KPSWidget: received PAGE" << endl;
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_interpreterBusy = false;
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unsetCursor();
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emit newPageImage( _backgroundPixmap );
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if ( _doubleBuffer ) setErasePixmap( _backgroundPixmap );
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return true;
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}
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else if( e->xclient.message_type == _atoms[DONE] )
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{
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kdDebug(4500) << "KPSWidget: received DONE" << endl;
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stopInterpreter();
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return true;
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}
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}
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return QWidget::x11Event( e );
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}
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#include "kpswidget.moc"
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// vim:sw=4:sts=4:ts=8:noet
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