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Diffstat (limited to 'src/gvcore/xcursor.cpp')
| -rw-r--r-- | src/gvcore/xcursor.cpp | 190 |
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 |