qgsnullpainterdevice.h

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/***************************************************************************
  qgsnullpainterdevice.h
  --------------------------------------
  Date                 : December 2021
  Copyright            : (C) 2013 by Mathieu Pellerin
  Email                : nirvn dot asia 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 QGSNULLPAINTERDEVICE_H
#define QGSNULLPAINTERDEVICE_H
 
#include <memory>
 
#include "qgis_core.h"
#include "qgis_sip.h"
 
#include <QPaintDevice>
#include <QPaintEngine>
 
#ifndef SIP_RUN
class QgsNullPaintEngine : public QPaintEngine
{
  public:
    QgsNullPaintEngine()
      : QPaintEngine( QPaintEngine::AllFeatures ) {};
 
    bool begin( QPaintDevice * ) override { return true; };
    bool end() override { return true; };
    QPaintEngine::Type type() const override { return QPaintEngine::User; };
    void updateState( const QPaintEngineState & ) override { return; };
 
    void drawRects( const QRect *, int ) override { return; };
    void drawRects( const QRectF *, int ) override { return; };
    void drawLines( const QLine *, int ) override { return; };
    void drawLines( const QLineF *, int ) override { return; };
    void drawEllipse( const QRectF & ) override { return; };
    void drawEllipse( const QRect & ) override { return; };
    void drawPath( const QPainterPath & ) override { return; };
    void drawPoints( const QPointF *, int ) override { return; };
    void drawPoints( const QPoint *, int ) override { return; };
    void drawPolygon( const QPointF *, int, PolygonDrawMode ) override { return; };
    void drawPolygon( const QPoint *, int, PolygonDrawMode ) override { return; };
    void drawPixmap( const QRectF &, const QPixmap &, const QRectF & ) override { return; };
    void drawTextItem( const QPointF &, const QTextItem & ) override { return; };
    void drawTiledPixmap( const QRectF &, const QPixmap &, const QPointF & ) override { return; };
    void drawImage( const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags ) override { return; };
};
#endif
 

class CORE_EXPORT QgsNullPaintDevice : public QPaintDevice
{
  public:
    QgsNullPaintDevice();
 
    QPaintEngine *paintEngine() const override;
 
    int metric( PaintDeviceMetric metric ) const override;

    void setOutputSize( const QSize &size ) { mSize = size; };

    void setOutputDpi( const int dpi ) { mDpi = dpi; };
 
  private:
    std::unique_ptr<QgsNullPaintEngine> mPaintEngine;
 
    QSize mSize;
    int mDpi = 96;
};
 
 
#endif // QGSNULLPAINTERDEVICE_H