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/***************************************************************************
qgsmaprenderercache.cpp
--------------------------------------
Date : December 2013
Copyright : (C) 2013 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* 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 "qgsmaprenderercache.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaplayer.h"
QgsMapRendererCache::QgsMapRendererCache()
{
clear();
}
void QgsMapRendererCache::clear()
{
QMutexLocker lock( &mMutex );
clearInternal();
}
void QgsMapRendererCache::clearInternal()
{
mExtent.setMinimal();
mScale = 0;
// make sure we are disconnected from all layers
foreach ( QString layerId, mCachedImages.keys() )
{
QgsMapLayer* layer = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( layer )
{
disconnect( layer, SIGNAL( repaintRequested() ), this, SLOT( layerRequestedRepaint() ) );
}
}
mCachedImages.clear();
}
bool QgsMapRendererCache::init( QgsRectangle extent, double scale )
{
QMutexLocker lock( &mMutex );
// check whether the params are the same
if ( extent == mExtent &&
scale == mScale )
return true;
clearInternal();
// set new params
mExtent = extent;
mScale = scale;
return false;
}
void QgsMapRendererCache::setCacheImage( QString layerId, const QImage& img )
{
QMutexLocker lock( &mMutex );
mCachedImages[layerId] = img;
// connect to the layer to listen to layer's repaintRequested() signals
QgsMapLayer* layer = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( layer )
{
connect( layer, SIGNAL( repaintRequested() ), this, SLOT( layerRequestedRepaint() ) );
}
}
QImage QgsMapRendererCache::cacheImage( QString layerId )
{
QMutexLocker lock( &mMutex );
return mCachedImages.value( layerId );
}
void QgsMapRendererCache::layerRequestedRepaint()
{
QgsMapLayer* layer = qobject_cast<QgsMapLayer*>( sender() );
if ( layer )
clearCacheImage( layer->id() );
}
void QgsMapRendererCache::clearCacheImage( QString layerId )
{
QMutexLocker lock( &mMutex );
mCachedImages.remove( layerId );
QgsMapLayer* layer = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( layer )
{
disconnect( layer, SIGNAL( repaintRequested() ), this, SLOT( layerRequestedRepaint() ) );
}
}
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