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authortpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-02-10 01:02:50 +0000
committertpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-02-10 01:02:50 +0000
commitc66249b79aa9bfa0924494adcd5345b5b1244b0c (patch)
tree19a77c57cc41d8b522554fbde0c36d6f20d7dc7b /src/gvcore/xcursor.cpp
downloadgwenview-c66249b79aa9bfa0924494adcd5345b5b1244b0c.tar.gz
gwenview-c66249b79aa9bfa0924494adcd5345b5b1244b0c.zip
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
Diffstat (limited to 'src/gvcore/xcursor.cpp')
-rw-r--r--src/gvcore/xcursor.cpp190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/gvcore/xcursor.cpp b/src/gvcore/xcursor.cpp
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+/* 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