Added old abandoned KDE3 version of gwenview

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/gwenview@1088034 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 190 insertions, 0 deletions

diff --git a/src/gvcore/xcursor.cpp b/src/gvcore/xcursor.cpp
new file mode 100644
index 0000000..79df377
--- /dev/null
+++ b/src/gvcore/xcursor.cpp
@@ -0,0 +1,190 @@
+/*  This file is part of the KDE libraries
+    Copyright (C) 2003 Fredrik Höglund <fredrik@kde.org>
+    Copyright (C) 2005 Lubos Lunak <l.lunak@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 <config.h>
+
+#include <assert.h>
+
+#include "xcursor.h"
+
+#include <qimage.h>
+#include <kdebug.h>
+#include <qvaluevector.h>
+
+#ifdef GV_HAVE_XCURSOR
+#include <X11/Xlib.h>
+#include <X11/Xcursor/Xcursor.h>
+#include <fixx11h.h>
+#endif
+
+namespace Gwenview {
+
+#ifdef GV_HAVE_XCURSOR
+class XCursorFormat : public QImageFormat {
+public:
+    XCursorFormat();
+    virtual int decode(QImage& img, QImageConsumer* consumer,
+	    const uchar* buffer, int length);
+    QByteArray array;
+    int pos;
+    bool was_seek_error;
+};
+
+extern "C"
+int xcursor_read( XcursorFile* file, unsigned char* buf, int len )
+{
+    XCursorFormat* data = reinterpret_cast< XCursorFormat* >( file->closure );
+    if( int( data->array.size()) - data->pos < len )
+    {
+        data->was_seek_error = true;
+        len = data->array.size() - data->pos;
+    }
+    memcpy( buf, data->array.data() + data->pos, len );
+    data->pos += len;
+    return len;
+}
+
+extern "C"
+int xcursor_write( XcursorFile*, unsigned char*, int )
+{
+    assert( false ); // not write support
+    return 0;
+}
+
+extern "C"
+int xcursor_seek( XcursorFile* file, long offset, int whence )
+{
+    XCursorFormat* data = reinterpret_cast< XCursorFormat* >( file->closure );
+    if( whence == SEEK_CUR )
+        offset += data->pos;
+    else if( whence == SEEK_END )
+        offset = data->array.size() + offset;
+    if( offset < 0 || offset >= int( data->array.size()))
+    {
+        data->was_seek_error = true;
+        return -1;
+    }
+    data->pos = offset;
+    return 0;
+}
+
+XCursorFormat::XCursorFormat()
+{
+}
+
+int XCursorFormat::decode(QImage& img, QImageConsumer* cons,
+	const uchar* buffer, int length)
+{
+    if( length > 0 )
+    {
+        int old_size = array.size();
+        array.resize( old_size + length );
+        memcpy( array.data() + old_size, buffer, length );
+    }
+// Qt's image async IO and Xcursor library have so nicely incompatible data reading :-/
+// Xcursor can read a file only as a whole. One can provide XcursorFile with functions
+// for reading, writing and seeking. And seeking is the stupid part on Xcursor's side,
+// as there's no way to suspend reading until more data is available. This means we
+// basically have to read the whole file first. However, Qt's image async IO just keeps
+// feeding data and when there's end of the data it just does nothing and doesn't tell
+// the decoder.
+// So the trick will be calling XcursorXcFileLoadImage() but whenever there will be
+// a seeking/reading error, then the function will fail and we'll try again when there's
+// more data. Also, reading everything first means we can't return without processing
+// further data after reaching end of a frame in the input as decode() doc says, but oh well.
+    XcursorFile file;
+    file.closure = this;
+    file.read = xcursor_read;
+    file.write = xcursor_write;
+    file.seek = xcursor_seek;
+    pos = 0;
+    was_seek_error = false;
+    XcursorImages *cursors = XcursorXcFileLoadImages( &file, 1024 ); // largest possible cursor size
+    if ( cursors )
+    {
+        for( int cur = 0;
+             cur < cursors->nimage;
+             ++cur )
+        {
+            XcursorImage* cursor = cursors->images[ cur ];
+            img = QImage( reinterpret_cast<uchar *>( cursor->pixels ),
+                cursor->width, cursor->height, 32, NULL, 0, QImage::BigEndian );
+            img.setAlphaBuffer( true );
+            // Convert the image to non-premultiplied alpha
+            Q_UINT32 *pixels = reinterpret_cast<Q_UINT32 *>( img.bits() );
+            for ( int i = 0; i < (img.width() * img.height()); i++ )
+            {
+                float alpha = qAlpha( pixels[i] ) / 255.0;
+                if ( alpha > 0.0 && alpha < 1.0 )
+                    pixels[i] = qRgba( int( qRed(pixels[i]) / alpha ),
+                                       int( qGreen(pixels[i]) / alpha ),
+                                       int( qBlue(pixels[i]) / alpha ),
+                                       qAlpha(pixels[i]) );
+	    }
+            // Create a deep copy of the image so the image data is preserved
+            img = img.copy();
+            if( cons )
+            {
+                if( cur == 0 )
+                {
+                    cons->setSize( img.width(), img.height());
+                    if( cursors->nimage > 1 )
+                        cons->setLooping( 0 );
+                }
+                cons->changed( QRect( QPoint( 0, 0 ), img.size()));
+                cons->frameDone();
+                cons->setFramePeriod( cursor->delay );
+            }
+        }
+        XcursorImagesDestroy( cursors );
+        if( cons )
+            cons->end();
+        return length;
+    }
+    else if( was_seek_error ) // try again next time
+        return length;
+    return -1; // failure
+}
+#endif
+
+QImageFormat* XCursorFormatType::decoderFor(
+    const uchar* buffer, int length)
+{
+#ifdef GV_HAVE_XCURSOR
+    if (length < 4) return 0;
+    if (buffer[0]=='X'
+     && buffer[1]=='c'
+     && buffer[2]=='u'
+     && buffer[3]=='r')
+	return new XCursorFormat;
+#else
+    Q_UNUSED( buffer );
+    Q_UNUSED( length );
+#endif
+    return 0;
+}
+
+const char* XCursorFormatType::formatName() const
+{
+    return "XCursor";
+}
+
+
+} // namespace