eps.cpp
// This library is distributed under the conditions of the GNU LGPL.
#include <unistd.h>
#include <stdio.h>
#include <qimage.h>
#include <qfile.h>
#include <qpainter.h>
#include <qprinter.h>
#include <kapplication.h>
#include <ktempfile.h>
#include <kdebug.h>
#include "eps.h"
#define BUFLEN 200
#define BBOX "%%BoundingBox:"
#define BBOX_LEN strlen(BBOX)
static bool seekToCodeStart( QIODevice * io, Q_UINT32 & ps_offset, Q_UINT32 & ps_size )
{
char buf[4]; // We at most need to read 4 bytes at a time
ps_offset=0L;
ps_size=0L;
if ( io->readBlock(buf, 2)!=2 ) // Read first two bytes
{
kdError(399) << "kimgio EPS: EPS file has less than 2 bytes." << endl;
return false;
}
if ( buf[0]=='%' && buf[1]=='!' ) // Check %! magic
{
kdDebug(399) << "kimgio EPS: normal EPS file" << endl;
}
else if ( buf[0]==char(0xc5) && buf[1]==char(0xd0) ) // Check start of MS-DOS EPS magic
{ // May be a MS-DOS EPS file
if ( io->readBlock(buf+2, 2)!=2 ) // Read further bytes of MS-DOS EPS magic
{
kdError(399) << "kimgio EPS: potential MS-DOS EPS file has less than 4 bytes." << endl;
return false;
}
if ( buf[2]==char(0xd3) && buf[3]==char(0xc6) ) // Check last bytes of MS-DOS EPS magic
{
if (io->readBlock(buf, 4)!=4) // Get offset of PostScript code in the MS-DOS EPS file.
{
kdError(399) << "kimgio EPS: cannot read offset of MS-DOS EPS file" << endl;
return false;
}
ps_offset // Offset is in little endian
= ((unsigned char) buf[0])
+ ((unsigned char) buf[1] << 8)
+ ((unsigned char) buf[2] << 16)
+ ((unsigned char) buf[3] << 24);
if (io->readBlock(buf, 4)!=4) // Get size of PostScript code in the MS-DOS EPS file.
{
kdError(399) << "kimgio EPS: cannot read size of MS-DOS EPS file" << endl;
return false;
}
ps_size // Size is in little endian
= ((unsigned char) buf[0])
+ ((unsigned char) buf[1] << 8)
+ ((unsigned char) buf[2] << 16)
+ ((unsigned char) buf[3] << 24);
kdDebug(399) << "kimgio EPS: Offset: " << ps_offset <<" Size: " << ps_size << endl;
if ( !io->at(ps_offset) ) // Get offset of PostScript code in the MS-DOS EPS file.
{
kdError(399) << "kimgio EPS: cannot seek in MS-DOS EPS file" << endl;
return false;
}
if ( io->readBlock(buf, 2)!=2 ) // Read first two bytes of what should be the Postscript code
{
kdError(399) << "kimgio EPS: PostScript code has less than 2 bytes." << endl;
return false;
}
if ( buf[0]=='%' && buf[1]=='!' ) // Check %! magic
{
kdDebug(399) << "kimgio EPS: MS-DOS EPS file" << endl;
}
else
{
kdError(399) << "kimgio EPS: supposed Postscript code of a MS-DOS EPS file doe not start with %!." << endl;
return false;
}
}
else
{
kdError(399) << "kimgio EPS: wrong magic for potential MS-DOS EPS file!" << endl;
return false;
}
}
else
{
kdError(399) << "kimgio EPS: not an EPS file!" << endl;
return false;
}
return true;
}
static bool bbox ( QIODevice *io, int *x1, int *y1, int *x2, int *y2)
{
char buf[BUFLEN+1];
bool ret = false;
while (io->readLine(buf, BUFLEN) > 0)
{
if (strncmp (buf, BBOX, BBOX_LEN) == 0)
{
// Some EPS files have non-integer values for the bbox
// We don't support that currently, but at least we parse it
float _x1, _y1, _x2, _y2;
if ( sscanf (buf, "%*s %f %f %f %f",
&_x1, &_y1, &_x2, &_y2) == 4) {
kdDebug(399) << "kimgio EPS BBOX: " << _x1 << " " << _y1 << " " << _x2 << " " << _y2 << endl;
*x1=(int)_x1; *y1=(int)_y1; *x2=(int)_x2; *y2=(int)_y2;
ret = true;
break;
}
}
}
return ret;
}
KDE_EXPORT void kimgio_eps_read (QImageIO *image)
{
kdDebug(399) << "kimgio EPS: starting..." << endl;
FILE * ghostfd;
int x1, y1, x2, y2;
//QTime dt;
//dt.start();
QString cmdBuf;
QString tmp;
QIODevice* io = image->ioDevice();
Q_UINT32 ps_offset, ps_size;
// find start of PostScript code
if ( !seekToCodeStart(io, ps_offset, ps_size) )
return;
// find bounding box
if ( !bbox (io, &x1, &y1, &x2, &y2)) {
kdError(399) << "kimgio EPS: no bounding box found!" << endl;
return;
}
KTempFile tmpFile;
tmpFile.setAutoDelete(true);
if( tmpFile.status() != 0 ) {
kdError(399) << "kimgio EPS: no temp file!" << endl;
return;
}
tmpFile.close(); // Close the file, we just want the filename
// x1, y1 -> translation
// x2, y2 -> new size
x2 -= x1;
y2 -= y1;
//kdDebug(399) << "origin point: " << x1 << "," << y1 << " size:" << x2 << "," << y2 << endl;
double xScale = 1.0;
double yScale = 1.0;
bool needsScaling = false;
int wantedWidth = x2;
int wantedHeight = y2;
if (image->parameters())
{
// Size forced by the caller
QStringList params = QStringList::split(':', image->parameters());
if (params.count() >= 2 && x2 != 0.0 && y2 != 0.0)
{
wantedWidth = params[0].toInt();
xScale = (double)wantedWidth / (double)x2;
wantedHeight = params[1].toInt();
yScale = (double)wantedHeight / (double)y2;
//kdDebug(399) << "wanted size:" << wantedWidth << "x" << wantedHeight << endl;
//kdDebug(399) << "scaling:" << xScale << "," << yScale << endl;
needsScaling = true;
}
}
// create GS command line
cmdBuf = "gs -sOutputFile=";
cmdBuf += tmpFile.name();
cmdBuf += " -q -g";
tmp.setNum( wantedWidth );
cmdBuf += tmp;
tmp.setNum( wantedHeight );
cmdBuf += "x";
cmdBuf += tmp;
cmdBuf += " -dSAFER -dPARANOIDSAFER -dNOPAUSE -sDEVICE=ppm -c "
"0 0 moveto "
"1000 0 lineto "
"1000 1000 lineto "
"0 1000 lineto "
"1 1 254 255 div setrgbcolor fill "
"0 0 0 setrgbcolor - -c showpage quit";
// run ghostview
ghostfd = popen (QFile::encodeName(cmdBuf), "w");
if ( ghostfd == 0 ) {
kdError(399) << "kimgio EPS: no GhostScript?" << endl;
return;
}
fprintf (ghostfd, "\n%d %d translate\n", -qRound(x1*xScale), -qRound(y1*yScale));
if ( needsScaling )
fprintf (ghostfd, "%g %g scale\n", xScale, yScale);
// write image to gs
io->reset(); // Go back to start of file to give all the file to GhostScript
if (ps_offset>0L) // We have an offset
io->at(ps_offset);
QByteArray buffer ( io->readAll() );
// If we have no MS-DOS EPS file or if the size seems wrong, then choose the buffer size
if (ps_size<=0L || ps_size>buffer.size())
ps_size=buffer.size();
fwrite(buffer.data(), sizeof(char), ps_size, ghostfd);
buffer.resize(0);
pclose ( ghostfd );
// load image
QImage myimage;
if( myimage.load (tmpFile.name()) ) {
image->setImage (myimage);
image->setStatus (0);
kdDebug(399) << "kimgio EPS: success!" << endl;
}
else
kdError(399) << "kimgio EPS: no image!" << endl;
//kdDebug(399) << "Loading EPS took " << (float)(dt.elapsed()) / 1000 << " seconds" << endl;
return;
}
// Sven Wiegand <SWiegand@tfh-berlin.de> -- eps output filter (from KSnapshot)
KDE_EXPORT void kimgio_eps_write( QImageIO *imageio )
{
QPrinter psOut(QPrinter::PrinterResolution);
QPainter p;
// making some definitions (papersize, output to file, filename):
psOut.setCreator( "KDE " KDE_VERSION_STRING );
psOut.setOutputToFile( true );
// Extension must be .eps so that Qt generates EPS file
KTempFile tmpFile(QString::null, ".eps");
tmpFile.setAutoDelete(true);
if ( tmpFile.status() != 0)
return;
tmpFile.close(); // Close the file, we just want the filename
psOut.setOutputFileName(tmpFile.name());
psOut.setFullPage(true);
// painting the pixmap to the "printer" which is a file
p.begin( &psOut );
// Qt uses the clip rect for the bounding box
p.setClipRect( 0, 0, imageio->image().width(), imageio->image().height(), QPainter::CoordPainter);
p.drawImage( QPoint( 0, 0 ), imageio->image() );
p.end();
// Copy file to imageio struct
QFile inFile(tmpFile.name());
inFile.open( IO_ReadOnly );
QTextStream in( &inFile );
in.setEncoding( QTextStream::Latin1 );
QTextStream out( imageio->ioDevice() );
out.setEncoding( QTextStream::Latin1 );
QString szInLine = in.readLine();
out << szInLine << '\n';
while( !in.atEnd() ){
szInLine = in.readLine();
out << szInLine << '\n';
}
inFile.close();
imageio->setStatus(0);
}

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