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/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "BaseSvgRenderer.h"
#include <QDomDocument>
#include <QFile>
#if WITH_ZLIB
#include <zlib.h>
#endif
namespace Svg
{
//________________________________________________
BaseSvgRenderer::BaseSvgRenderer():
QSvgRenderer(),
Counter( "Svg::BaseSvgRenderer" )
{}
//________________________________________________
void BaseSvgRenderer::createStyleSheet( QPalette palette )
{
palette.setCurrentColorGroup( QPalette::Active );
styleSheet_.clear();
auto addColor = [](QString name, QColor color )
{ return QString( ".ColorScheme-%1 {\n color:%2;\n stop-color:%2;\n}\n" ).arg( name, color.name()); };
styleSheet_ += addColor( "Text", palette.color( QPalette::WindowText ) );
styleSheet_ += addColor( "Background", palette.color( QPalette::Window ) );
styleSheet_ += addColor( "Highlight", palette.color( QPalette::Highlight ) );
styleSheet_ += addColor( "ViewText", palette.color( QPalette::Text ) );
styleSheet_ += addColor( "ViewBackground", palette.color( QPalette::Base ) );
styleSheet_ += addColor( "ViewHover", palette.color( QPalette::Highlight ) );
styleSheet_ += addColor( "ViewFocus", palette.color( QPalette::Highlight ) );
styleSheet_ += addColor( "ButtonText", palette.color( QPalette::ButtonText ) );
styleSheet_ += addColor( "ButtonBackground", palette.color( QPalette::Button ) );
styleSheet_ += addColor( "ButtonHover", palette.color( QPalette::Highlight ) );
styleSheet_ += addColor( "ButtonFocus", palette.color( QPalette::Highlight ) );
}
//________________________________________________
bool BaseSvgRenderer::load( const QString& filename )
{
// ret
styleSheetIsUsed_ = false;
#if WITH_ZLIB
// open file
QFile in( filename );
in.open( QIODevice::ReadOnly );
if( !( in.isOpen() && in.isReadable() ) ) return false;
// when zlib is available we try to uncompress the file manually before passing to QSvgRenderer
// this will allow to alter the file and in particular to change colors using current palette.
auto content = _tryUncompress( in );
if( content.isEmpty() )
{
in.seek(0);
content = in.readAll();
}
// update stylesheet
styleSheetIsUsed_ = content.contains( "current-color-scheme" );
if( !styleSheet_.isEmpty() && styleSheetIsUsed_ )
{
QDomDocument document;
document.setContent( content );
// create new style element
QDomElement element = document.createElement( QLatin1String( "style" ) );
element.setAttribute( QLatin1String( "type" ), QLatin1String( "text/css" ) );
element.setAttribute( QLatin1String( "id" ), QLatin1String( "current-color-scheme" ) );
element.appendChild( document.createTextNode( styleSheet_ ) );
// find child in document
auto&& children( document.elementsByTagName( element.tagName() ) );
bool replaced( false );
for( int i = 0; i < children.size() && !replaced; ++i )
{
auto&& child( children.at(i) );
if( child.toElement().attribute( QLatin1String( "id" ) ) == QLatin1String( "current-color-scheme" ) )
{
auto parent( child.parentNode() );
parent.replaceChild( element, child );
replaced = true;
break;
}
}
if( replaced ) content = document.toByteArray();
}
bool loaded( QSvgRenderer::load( content ) );
#else
// load filename directly
bool loaded( QSvgRenderer::load( filename ) );
#endif
return loaded;
}
//________________________________________________
QByteArray BaseSvgRenderer::_tryUncompress( QIODevice& in ) const
{
QByteArray out;
if( !( in.isOpen() && in.isReadable() ) ) return out;
#if WITH_ZLIB
// initialize zlib stream
z_stream stream;
stream.zalloc = nullptr;
stream.zfree = nullptr;
stream.opaque = nullptr;
stream.avail_in = 0;
stream.next_in = nullptr;
if( inflateInit2(&stream, MAX_WBITS + 16) != Z_OK) return out;
// read chunks of max size chunksize from input source
const int chunkSize = 16384;
forever
{
// read chunk from input and store in stream
auto source = in.read( chunkSize );
if( source.isEmpty() )
{
out.chop(stream.avail_out);
break;
}
stream.avail_in = source.size();
stream.next_in = reinterpret_cast<Bytef*>(source.data());
// uncompress chunk and append to output stream
int result = Z_OK;
do
{
// prepare destination buffer
auto size = out.size();
out.resize( size+chunkSize );
stream.avail_out = chunkSize;
stream.next_out = reinterpret_cast<Bytef*>(out.data() + size);
result = inflate(&stream, Z_NO_FLUSH);
switch( result )
{
case Z_NEED_DICT:
case Z_DATA_ERROR:
case Z_STREAM_ERROR:
case Z_MEM_ERROR:
{
inflateEnd( &stream );
out.chop(stream.avail_out);
return out;
}
}
} while( stream.avail_out == 0 );
// Chop off trailing space in the buffer
out.chop(stream.avail_out);
if( result == Z_STREAM_END )
{
// Make sure there are no more members to process before exiting
if( !(stream.avail_in && inflateReset(&stream) == Z_OK ) ) break;
}
}
inflateEnd(&stream);
#endif
return out;
}
}
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