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qgssvgcache.cpp
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qgssvgcache.cpp
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/***************************************************************************
qgssvgcache.h
------------------------------
begin : 2011
copyright : (C) 2011 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#include "qgssvgcache.h"
#include "qgslogger.h"
#include <QDomDocument>
#include <QDomElement>
#include <QFile>
#include <QImage>
#include <QPainter>
#include <QPicture>
#include <QSvgRenderer>
QgsSvgCacheEntry::QgsSvgCacheEntry(): file( QString() ), size( 0 ), outlineWidth( 0 ), widthScaleFactor( 1.0 ), rasterScaleFactor( 1.0 ), fill( Qt::black ),
outline( Qt::black ), image( 0 ), picture( 0 )
{
}
QgsSvgCacheEntry::QgsSvgCacheEntry( const QString& f, double s, double ow, double wsf, double rsf, const QColor& fi, const QColor& ou ): file( f ), size( s ), outlineWidth( ow ),
widthScaleFactor( wsf ), rasterScaleFactor( rsf ), fill( fi ), outline( ou ), image( 0 ), picture( 0 )
{
}
QgsSvgCacheEntry::~QgsSvgCacheEntry()
{
delete image;
delete picture;
}
bool QgsSvgCacheEntry::operator==( const QgsSvgCacheEntry& other ) const
{
return ( other.file == file && other.size == size && other.outlineWidth == outlineWidth && other.widthScaleFactor == widthScaleFactor
&& other.rasterScaleFactor == rasterScaleFactor && other.fill == fill && other.outline == outline );
}
QString file;
double size;
double outlineWidth;
double widthScaleFactor;
double rasterScaleFactor;
QColor fill;
QColor outline;
QgsSvgCache* QgsSvgCache::mInstance = 0;
QgsSvgCache* QgsSvgCache::instance()
{
if ( !mInstance )
{
mInstance = new QgsSvgCache();
}
return mInstance;
}
QgsSvgCache::QgsSvgCache(): mTotalSize( 0 )
{
}
QgsSvgCache::~QgsSvgCache()
{
QMultiHash< QString, QgsSvgCacheEntry* >::iterator it = mEntryLookup.begin();
for ( ; it != mEntryLookup.end(); ++it )
{
delete it.value();
}
}
const QImage& QgsSvgCache::svgAsImage( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
double widthScaleFactor, double rasterScaleFactor )
{
QgsSvgCacheEntry* currentEntry = cacheEntry( file, size, fill, outline, outlineWidth, widthScaleFactor, rasterScaleFactor );
//if current entry image is 0: cache image for entry
//update stats for memory usage
if ( !currentEntry->image )
{
cacheImage( currentEntry );
}
//debug: display current cache usage
QgsDebugMsg( "cache size: " + QString::number( mTotalSize ) );
//set entry timestamp to current time
currentEntry->lastUsed = QDateTime::currentDateTime();
return *( currentEntry->image );
}
const QPicture& QgsSvgCache::svgAsPicture( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
double widthScaleFactor, double rasterScaleFactor )
{
QgsSvgCacheEntry* currentEntry = cacheEntry( file, size, fill, outline, outlineWidth, widthScaleFactor, rasterScaleFactor );
//if current entry image is 0: cache image for entry
//update stats for memory usage
if ( !currentEntry->picture )
{
cachePicture( currentEntry );
}
//debug: display current cache usage
QgsDebugMsg( "cache size: " + QString::number( mTotalSize ) );
//set entry timestamp to current time
currentEntry->lastUsed = QDateTime::currentDateTime();
return *( currentEntry->picture );
}
QgsSvgCacheEntry* QgsSvgCache::insertSVG( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
double widthScaleFactor, double rasterScaleFactor )
{
QgsSvgCacheEntry* entry = new QgsSvgCacheEntry( file, size, outlineWidth, widthScaleFactor, rasterScaleFactor, fill, outline );
entry->lastUsed = QDateTime::currentDateTime();
replaceParamsAndCacheSvg( entry );
mEntryLookup.insert( file, entry );
return entry;
}
void QgsSvgCache::containsParams( const QString& path, bool& hasFillParam, bool& hasOutlineParam, bool& hasOutlineWidthParam ) const
{
hasFillParam = false;
hasOutlineParam = false;
hasOutlineWidthParam = false;
QFile svgFile( path );
if ( !svgFile.open( QIODevice::ReadOnly ) )
{
return;
}
QDomDocument svgDoc;
if ( !svgDoc.setContent( &svgFile ) )
{
return;
}
//there are surely faster ways to get this information
QString content = svgDoc.toString();
if ( content.contains( "param(fill" ) )
{
hasFillParam = true;
}
if ( content.contains( "param(outline" ) )
{
hasOutlineParam = true;
}
if ( content.contains( "param(outline-width)" ) )
{
hasOutlineWidthParam = true;
}
}
void QgsSvgCache::replaceParamsAndCacheSvg( QgsSvgCacheEntry* entry )
{
if ( !entry )
{
return;
}
QFile svgFile( entry->file );
if ( !svgFile.open( QIODevice::ReadOnly ) )
{
return;
}
QDomDocument svgDoc;
if ( !svgDoc.setContent( &svgFile ) )
{
return;
}
//replace fill color, outline color, outline with in all nodes
QDomElement docElem = svgDoc.documentElement();
replaceElemParams( docElem, entry->fill, entry->outline, entry->outlineWidth );
entry->svgContent = svgDoc.toByteArray();
mTotalSize += entry->svgContent.size();
}
void QgsSvgCache::cacheImage( QgsSvgCacheEntry* entry )
{
if ( !entry )
{
return;
}
delete entry->image;
entry->image = 0;
double imageSize = entry->size * entry->widthScaleFactor * entry->rasterScaleFactor;
QImage* image = new QImage( imageSize, imageSize, QImage::Format_ARGB32_Premultiplied );
image->fill( 0 ); // transparent background
QPainter p( image );
QSvgRenderer r( entry->svgContent );
r.render( &p );
entry->image = image;
mTotalSize += ( image->width() * image->height() * 32 );
}
void QgsSvgCache::cachePicture( QgsSvgCacheEntry *entry )
{
if ( !entry )
{
return;
}
delete entry->picture;
entry->picture = 0;
//correct QPictures dpi correction
QPicture* picture = new QPicture();
double dpi = entry->widthScaleFactor * 25.4 * entry->rasterScaleFactor;
double pictureSize = entry->size * entry->widthScaleFactor / dpi * picture->logicalDpiX();
QRectF rect( QPointF( -pictureSize / 2.0, -pictureSize / 2.0 ), QSizeF( pictureSize, pictureSize ) );
QSvgRenderer renderer( entry->svgContent );
QPainter painter( picture );
renderer.render( &painter, rect );
entry->picture = picture;
mTotalSize += entry->picture->size();
}
QgsSvgCacheEntry* QgsSvgCache::cacheEntry( const QString& file, double size, const QColor& fill, const QColor& outline, double outlineWidth,
double widthScaleFactor, double rasterScaleFactor )
{
//search entries in mEntryLookup
QgsSvgCacheEntry* currentEntry = 0;
QList<QgsSvgCacheEntry*> entries = mEntryLookup.values( file );
QList<QgsSvgCacheEntry*>::iterator entryIt = entries.begin();
for ( ; entryIt != entries.end(); ++entryIt )
{
QgsSvgCacheEntry* cacheEntry = *entryIt;
if ( cacheEntry->file == file && cacheEntry->size == size && cacheEntry->fill == fill && cacheEntry->outline == outline &&
cacheEntry->outlineWidth == outlineWidth && cacheEntry->widthScaleFactor == widthScaleFactor && cacheEntry->rasterScaleFactor == rasterScaleFactor )
{
currentEntry = cacheEntry;
break;
}
}
//if not found: create new entry
//cache and replace params in svg content
if ( !currentEntry )
{
currentEntry = insertSVG( file, size, fill, outline, outlineWidth, widthScaleFactor, rasterScaleFactor );
}
return currentEntry;
}
void QgsSvgCache::replaceElemParams( QDomElement& elem, const QColor& fill, const QColor& outline, double outlineWidth )
{
if ( elem.isNull() )
{
return;
}
//go through attributes
QDomNamedNodeMap attributes = elem.attributes();
int nAttributes = attributes.count();
for ( int i = 0; i < nAttributes; ++i )
{
QDomAttr attribute = attributes.item( i ).toAttr();
//e.g. style="fill:param(fill);param(stroke)"
if ( attribute.name().compare( "style", Qt::CaseInsensitive ) == 0 )
{
//entries separated by ';'
QString newAttributeString;
QStringList entryList = attribute.value().split( ';' );
QStringList::const_iterator entryIt = entryList.constBegin();
for ( ; entryIt != entryList.constEnd(); ++entryIt )
{
QStringList keyValueSplit = entryIt->split( ':' );
if ( keyValueSplit.size() < 2 )
{
continue;
}
QString key = keyValueSplit.at( 0 );
QString value = keyValueSplit.at( 1 );
if ( value.startsWith( "param(fill" ) )
{
value = fill.name();
}
else if ( value.startsWith( "param(outline)" ) )
{
value = outline.name();
}
else if ( value.startsWith( "param(outline-width)" ) )
{
value = QString::number( outlineWidth );
}
newAttributeString.append( key + ":" + value + ";" );
}
elem.setAttribute( attribute.name(), newAttributeString );
}
else
{
QString value = attribute.value();
if ( value.startsWith( "param(fill)" ) )
{
elem.setAttribute( attribute.name(), fill.name() );
}
else if ( value.startsWith( "param(outline)" ) )
{
elem.setAttribute( attribute.name(), outline.name() );
}
else if ( value.startsWith( "param(outline-width)" ) )
{
elem.setAttribute( attribute.name(), QString::number( outlineWidth ) );
}
}
}
QDomNodeList childList = elem.childNodes();
int nChildren = childList.count();
for ( int i = 0; i < nChildren; ++i )
{
QDomElement childElem = childList.at( i ).toElement();
replaceElemParams( childElem, fill, outline, outlineWidth );
}
}
void QgsSvgCache::removeCacheEntry( QString s, QgsSvgCacheEntry* entry )
{
delete entry;
mEntryLookup.remove( s , entry );
}