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/* This file is part of the KDE libraries
Copyright (C) 2000,2002 Carsten Pfeiffer <pfeiffer@kde.org>
2000 Malte Starostik <malte@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <qfile.h>
#include <qpixmap.h>
#include <qimage.h>
#include <kstandarddirs.h>
#include <kpixmapsplitter.h>
#include <kmimetype.h>
#include "textcreator.h"
extern "C"
{
KDE_EXPORT ThumbCreator *new_creator()
{
return new TextCreator;
}
}
TextCreator::TextCreator()
: m_splitter(0),
m_data(0),
m_dataSize(0)
{
}
TextCreator::~TextCreator()
{
delete m_splitter;
delete [] m_data;
}
bool TextCreator::create(const QString &path, int width, int height, QImage &img)
{
// Filter out unwanted mimetypes
KMimeType::Ptr mimeType = KMimeType::findByPath( path );
if ( mimeType->is( "text/rtf" ) )
return false;
if ( !m_splitter )
{
m_splitter = new KPixmapSplitter;
QString pixmap = locate( "data", "konqueror/pics/thumbnailfont_7x4.png" );
if ( !pixmap.isEmpty() )
{
// FIXME: make font/glyphsize configurable...
m_splitter->setPixmap( QPixmap( pixmap ));
m_splitter->setItemSize( QSize( 4, 7 ));
}
}
bool ok = false;
// determine some sizes...
// example: width: 60, height: 64
QSize pixmapSize( width, height );
if (height * 3 > width * 4)
pixmapSize.setHeight( width * 4 / 3 );
else
pixmapSize.setWidth( height * 3 / 4 );
if ( pixmapSize != m_pixmap.size() )
m_pixmap.resize( pixmapSize );
// one pixel for the rectangle, the rest. whitespace
int xborder = 1 + pixmapSize.width()/16; // minimum x-border
int yborder = 1 + pixmapSize.height()/16; // minimum y-border
QSize chSize = m_splitter->itemSize(); // the size of one char
int xOffset = chSize.width();
int yOffset = chSize.height();
// calculate a better border so that the text is centered
int canvasWidth = pixmapSize.width() - 2*xborder;
int canvasHeight = pixmapSize.height() - 2*yborder;
int numCharsPerLine = (int) (canvasWidth / chSize.width());
int numLines = (int) (canvasHeight / chSize.height());
// assumes an average line length of <= 120 chars
const int bytesToRead = 120 * numLines;
// create text-preview
QFile file( path );
if ( file.open( IO_ReadOnly ))
{
if ( !m_data || m_dataSize < bytesToRead + 1 )
{
delete [] m_data;
m_data = new char[bytesToRead+1];
m_dataSize = bytesToRead + 1;
}
int read = file.readBlock( m_data, bytesToRead );
if ( read > 0 )
{
ok = true;
m_data[read] = '\0';
QString text = QString::fromLocal8Bit( m_data );
// FIXME: maybe strip whitespace and read more?
m_pixmap.fill( QColor( 245, 245, 245 ) ); // light-grey background
QRect rect;
int rest = m_pixmap.width() - (numCharsPerLine * chSize.width());
xborder = QMAX( xborder, rest/2); // center horizontally
rest = m_pixmap.height() - (numLines * chSize.height());
yborder = QMAX( yborder, rest/2); // center vertically
// end centering
int x = xborder, y = yborder; // where to paint the characters
int posNewLine = m_pixmap.width() - (chSize.width() + xborder);
int posLastLine = m_pixmap.height() - (chSize.height() + yborder);
bool newLine = false;
Q_ASSERT( posNewLine > 0 );
const QPixmap *fontPixmap = &(m_splitter->pixmap());
for ( uint i = 0; i < text.length(); i++ )
{
if ( x > posNewLine || newLine ) // start a new line?
{
x = xborder;
y += yOffset;
if ( y > posLastLine ) // more text than space
break;
// after starting a new line, we also jump to the next
// physical newline in the file if we don't come from one
if ( !newLine )
{
int pos = text.find( '\n', i );
if ( pos == -1 )
break;
i = pos + 1;
}
newLine = false;
}
// check for newlines in the text (unix,dos)
QChar ch = text.at( i );
if ( ch == '\n' )
{
newLine = true;
continue;
}
else if ( ch == '\r' && text.at(i+1) == '\n' )
{
newLine = true;
i++; // skip the next character (\n) as well
continue;
}
rect = m_splitter->coordinates( ch );
if ( !rect.isEmpty() )
{
bitBlt( &m_pixmap, QPoint(x,y), fontPixmap, rect, Qt::CopyROP );
}
x += xOffset; // next character
}
if (ok)
img = m_pixmap.convertToImage();
}
file.close();
}
return ok;
}
ThumbCreator::Flags TextCreator::flags() const
{
return (Flags)(DrawFrame | BlendIcon);
}
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