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/**
* QImageIO Routines to read/write XV images.
* copyright (c) 1998 Torben Weis <weis@kde.org>
* copyright (c) 1999 Oliver Eiden <o.eiden@pop.ruhr.de>
*
* This library is distributed under the conditions of the GNU LGPL.
*/
#include "xview.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <QtGui/QImage>
#define BUFSIZE 1024
static const int b_255_3[]= {0,85,170,255}, // index*255/3
rg_255_7[]={0,36,72,109,145,182,218,255}; // index *255/7
XVHandler::XVHandler()
{
}
bool XVHandler::canRead() const
{
if (canRead(device())) {
setFormat("xv");
return true;
}
return false;
}
bool XVHandler::read(QImage *retImage)
{
int x=-1;
int y=-1;
int maxval=-1;
QIODevice *iodev = device();
char str[ BUFSIZE ];
// magic number must be "P7 332"
iodev->readLine( str, BUFSIZE );
if (strncmp(str,"P7 332",6))
return false;
// next line #XVVERSION
iodev->readLine( str, BUFSIZE );
if (strncmp(str, "#XVVERSION", 10))
return false;
// now it gets interesting, #BUILTIN means we are out.
// if IMGINFO comes, we are happy!
iodev->readLine( str, BUFSIZE );
if (strncmp(str, "#IMGINFO:", 9))
return false;
// after this an #END_OF_COMMENTS signals everything to be ok!
iodev->readLine( str, BUFSIZE );
if (strncmp(str, "#END_OF", 7))
return false;
// now a last line with width, height, maxval which is
// supposed to be 255
iodev->readLine( str, BUFSIZE );
sscanf(str, "%d %d %d", &x, &y, &maxval);
if (maxval != 255)
return false;
int blocksize = x*y;
if(x < 0 || y < 0 || blocksize < x || blocksize < y)
return false;
// now follows a binary block of x*y bytes.
char *block = (char*) malloc(blocksize);
if(!block)
return false;
if (iodev->read(block, blocksize) != blocksize )
{
free(block);
return false;
}
// Create the image
QImage image( x, y, QImage::Format_Indexed8 );
int numColors;
numColors = qMin( maxval + 1, 0 );
numColors = qMax( 0, maxval + 1 );
image.setNumColors( numColors );
// how do the color handling? they are absolute 24bpp
// or at least can be calculated as such.
int r,g,b;
for ( int j = 0; j < 256; j++ )
{
r = rg_255_7[((j >> 5) & 0x07)];
g = rg_255_7[((j >> 2) & 0x07)];
b = b_255_3[((j >> 0) & 0x03)];
image.setColor( j, qRgb( r, g, b ) );
}
for ( int py = 0; py < y; py++ )
{
uchar *data = image.scanLine( py );
memcpy( data, block + py * x, x );
}
*retImage = image;
free(block);
return true;
}
bool XVHandler::write(const QImage &image)
{
QIODevice& f = *( device() );
// Removed "f.open(...)" and "f.close()" (tanghus)
int w = image.width(), h = image.height();
char str[ 1024 ];
// magic number must be "P7 332"
f.write( "P7 332\n", 7 );
// next line #XVVERSION
f.write( "#XVVERSION:\n", 12 );
// now it gets interesting, #BUILTIN means we are out.
// if IMGINFO comes, we are happy!
f.write( "#IMGINFO:\n", 10 );
// after this an #END_OF_COMMENTS signals everything to be ok!
f.write( "#END_OF_COMMENTS:\n", 18 );
// now a last line with width, height, maxval which is supposed to be 255
sprintf( str, "%i %i 255\n", w, h );
f.write( str, strlen( str ) );
QImage tmpImage( image );
if ( image.depth() == 1 )
tmpImage = image.convertToFormat( QImage::Format_Indexed8, Qt::AutoColor );
uchar* buffer = new uchar[ w ];
for ( int py = 0; py < h; py++ )
{
const uchar *data = tmpImage.scanLine( py );
for ( int px = 0; px < w; px++ )
{
int r, g, b;
if ( tmpImage.depth() == 32 )
{
const QRgb *data32 = (QRgb*) data;
r = qRed( *data32 ) >> 5;
g = qGreen( *data32 ) >> 5;
b = qBlue( *data32 ) >> 6;
data += sizeof( QRgb );
}
else
{
QRgb color = tmpImage.color( *data );
r = qRed( color ) >> 5;
g = qGreen( color ) >> 5;
b = qBlue( color ) >> 6;
data++;
}
buffer[ px ] = ( r << 5 ) | ( g << 2 ) | b;
}
f.write( (const char*)buffer, w );
}
delete[] buffer;
return true;
}
QByteArray XVHandler::name() const
{
return "xv";
}
bool XVHandler::canRead(QIODevice *device)
{
if (!device) {
qWarning("XVHandler::canRead() called with no device");
return false;
}
qint64 oldPos = device->pos();
char head[6];
qint64 readBytes = device->read(head, sizeof(head));
if (readBytes != sizeof(head)) {
if (device->isSequential()) {
while (readBytes > 0)
device->ungetChar(head[readBytes-- - 1]);
} else {
device->seek(oldPos);
}
return false;
}
if (device->isSequential()) {
while (readBytes > 0)
device->ungetChar(head[readBytes-- - 1]);
} else {
device->seek(oldPos);
}
return qstrncmp(head, "P7 332", 6) == 0;
}
class XVPlugin : public QImageIOPlugin
{
public:
QStringList keys() const;
Capabilities capabilities(QIODevice *device, const QByteArray &format) const;
QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const;
};
QStringList XVPlugin::keys() const
{
return QStringList() << "xv";
}
QImageIOPlugin::Capabilities XVPlugin::capabilities(QIODevice *device, const QByteArray &format) const
{
if (format == "xv")
return Capabilities(CanRead | CanWrite);
if (!format.isEmpty())
return 0;
if (!device->isOpen())
return 0;
Capabilities cap;
if (device->isReadable() && XVHandler::canRead(device))
cap |= CanRead;
if (device->isWritable())
cap |= CanWrite;
return cap;
}
QImageIOHandler *XVPlugin::create(QIODevice *device, const QByteArray &format) const
{
QImageIOHandler *handler = new XVHandler;
handler->setDevice(device);
handler->setFormat(format);
return handler;
}
Q_EXPORT_STATIC_PLUGIN(XVPlugin)
Q_EXPORT_PLUGIN2(xv, XVPlugin)
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