qgsterraintextureimage_p.cpp

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/***************************************************************************
  qgsterraintextureimage_p.cpp
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 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 "qgsterraintextureimage_p.h"
 
#include <Qt3DRender/QTextureImageDataGenerator>
 
#include "moc_qgsterraintextureimage_p.cpp"

 
class TerrainTextureImageDataGenerator : public Qt3DRender::QTextureImageDataGenerator
{
  public:
    static QImage placeholderImage()
    {
      // simple placeholder image
      QImage i( 2, 2, QImage::Format_RGB32 );
      i.setPixelColor( 0, 0, Qt::darkGray );
      i.setPixelColor( 1, 0, Qt::lightGray );
      i.setPixelColor( 0, 1, Qt::lightGray );
      i.setPixelColor( 1, 1, Qt::darkGray );
      return i;
    }
 
    TerrainTextureImageDataGenerator( const QgsRectangle &extent, const QString &debugText, const QImage &img, int version )
      : mExtent( extent )
      , mDebugText( debugText )
      , mImage( img )
      , mVersion( version )
    {}
 
    Qt3DRender::QTextureImageDataPtr operator()() override
    {
      Qt3DRender::QTextureImageDataPtr dataPtr = Qt3DRender::QTextureImageDataPtr::create();
      dataPtr->setImage( mImage.isNull() ? placeholderImage() : mImage ); // will copy image data to the internal byte array
      dataPtr->setFormat( QOpenGLTexture::TextureFormat::SRGB8_Alpha8 );
      return dataPtr;
    }
 
    qintptr id() const override { return reinterpret_cast<qintptr>( &Qt3DCore::FunctorType<TerrainTextureImageDataGenerator>::id ); }
 
    bool operator==( const QTextureImageDataGenerator &other ) const override
    {
      const TerrainTextureImageDataGenerator *otherFunctor = dynamic_cast<const TerrainTextureImageDataGenerator *>( &other );
      return otherFunctor && otherFunctor->mVersion == mVersion && mExtent == otherFunctor->mExtent;
    }
 
  private:
    QgsRectangle mExtent;
    QString mDebugText;
    QImage mImage;
    int mVersion;
};

 
 
QgsTerrainTextureImage::QgsTerrainTextureImage( const QImage &image, const QgsRectangle &extent, const QString &debugText, Qt3DCore::QNode *parent )
  : Qt3DRender::QAbstractTextureImage( parent )
  , mExtent( extent )
  , mDebugText( debugText )
  , mImage( image )
{}
 
Qt3DRender::QTextureImageDataGeneratorPtr QgsTerrainTextureImage::dataGenerator() const
{
  return Qt3DRender::QTextureImageDataGeneratorPtr( new TerrainTextureImageDataGenerator( mExtent, mDebugText, mImage, mVersion ) );
}
 
void QgsTerrainTextureImage::invalidate()
{
  mImage = QImage();
  mVersion++;
  notifyDataGeneratorChanged();
}
 
void QgsTerrainTextureImage::setImage( const QImage &img )
{
  this->mImage = img;
  mVersion++;
  notifyDataGeneratorChanged();
}