Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 195 insertions, 0 deletions

diff --git a/kioslave/thumbnail/textcreator.cpp b/kioslave/thumbnail/textcreator.cpp
new file mode 100644
index 000000000..b0424e228
--- /dev/null
+++ b/kioslave/thumbnail/textcreator.cpp
@@ -0,0 +1,195 @@
+/*  This file is part of the KDE libraries
+    Copyright (C) 2000,2002 Carsten Pfeiffer <[email protected]>
+                  2000 Malte Starostik <[email protected]>
+
+    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);
+}
+