qgsimagecache.h

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/***************************************************************************
                         qgsimagecache.h
                         ---------------
    begin                : December 2018
    copyright            : (C) 2018 by Nyall Dawson
    email                : nyall dot dawson 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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSIMAGECACHE_H
#define QGSIMAGECACHE_H
 
#include "qgsabstractcontentcache.h"
#include "qgis_sip.h"
#include "qgis_core.h"
 
#include <QElapsedTimer>
#include <QSize>
#include <QImage>
 
#ifndef SIP_RUN
 
 
class CORE_EXPORT QgsImageCacheEntry : public QgsAbstractContentCacheEntry
{
  public:
 
    QgsImageCacheEntry( const QString &path, QSize size, bool keepAspectRatio, double opacity, double targetDpi ) ;
 
    QSize size;
 
    bool keepAspectRatio = true;
 
    double opacity = 1.0;
 
    QImage image;
 
    bool isMissingImage = false;
 
    double targetDpi = 96;
 
    int dataSize() const override;
    void dump() const override;
    bool isEqual( const QgsAbstractContentCacheEntry *other ) const override;
 
};
 
#endif
 
#ifdef SIP_RUN
class CORE_EXPORT QgsImageCache : public QgsAbstractContentCacheBase // for sip we skip to the base class and avoid the template difficulty
{
#else
class CORE_EXPORT QgsImageCache : public QgsAbstractContentCache< QgsImageCacheEntry >
{
#endif
    Q_OBJECT
 
  public:
 
    QgsImageCache( QObject *parent SIP_TRANSFERTHIS = nullptr );
 
#ifndef SIP_RUN
    QImage pathAsImage( const QString &path, const QSize size, const bool keepAspectRatio, const double opacity, bool &fitsInCache SIP_OUT, bool blocking = false, double targetDpi = 96, bool *isMissing = nullptr );
#else
    QImage pathAsImage( const QString &path, const QSize size, const bool keepAspectRatio, const double opacity, bool &fitsInCache SIP_OUT, bool blocking = false, double targetDpi = 96 );
#endif
 
    QSize originalSize( const QString &path, bool blocking = false ) const;
 
  signals:
 
    void remoteImageFetched( const QString &url );
 
  private:
 
    QImage renderImage( const QString &path, QSize size, const bool keepAspectRatio, const double opacity, double targetDpi, bool &isBroken, bool blocking = false ) const;
 
    QByteArray mMissingSvg;
 
    QByteArray mFetchingSvg;
 
    friend class TestQgsImageCache;
};
 
#endif // QGSIMAGECACHE_H