File indexing completed on 2024-05-12 04:19:40

 /*
 Gwenview: an image viewer
 Copyright 2021 Arjen Hiemstra <ahiemstra@heimr.nl>
 
 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.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
 
 */
 
 #ifndef RASTERIMAGEITEM_H
 #define RASTERIMAGEITEM_H
 
 #include <QGraphicsItem>
 
 #include "lib/renderingintent.h"
 
 namespace Gwenview
 {
 class RasterImageView;
 
 /**
  * A QGraphicsItem subclass responsible for rendering the main raster image.
  *
  * This class is resposible for painting the main image when it is a raster
  * image. It will get the visible area from the main image, translate and scale
  * this based on the values from the parent ImageView, then apply color
  * correction. Finally the result will be drawn to the screen.
  *
  * For performance, two extra images are cached, one at a third of the image
  * size and one at a sixth. These are used at low zoom levels, to avoid having
  * to copy large amounts of image data that later gets discarded.
  */
 class RasterImageItem : public QGraphicsItem
 {
 public:
     RasterImageItem(RasterImageView *parent);
     ~RasterImageItem() override;
 
     /**
      * Set the rendering intent for color correction.
      */
     void setRenderingIntent(RenderingIntent::Enum intent);
 
     /**
      * Update the internal, smaller cached versions of the main image.
      */
     void updateCache();
 
     /**
      * Reimplemented from QGraphicsItem::paint
      */
     virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
 
     /**
      * Reimplemented from QGraphicsItem::boundingRect
      */
     virtual QRectF boundingRect() const override;
 
 private:
     void applyDisplayTransform(QImage &image);
     void updateDisplayTransform(QImage::Format format);
 
     RasterImageView *mParentView;
     bool mApplyDisplayTransform = true;
     cmsHTRANSFORM mDisplayTransform = nullptr;
     cmsUInt32Number mRenderingIntent = INTENT_PERCEPTUAL;
 
     QImage mOriginalImage;
     QImage mThirdScaledImage;
     QImage mSixthScaledImage;
 };
 
 }
 
 #endif // RASTERIMAGEITEM_H