87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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/*
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Gwenview: an image viewer
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Copyright 2021 Arjen Hiemstra <ahiemstra@heimr.nl>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
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*/
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#ifndef RASTERIMAGEITEM_H
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#define RASTERIMAGEITEM_H
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#include <QGraphicsItem>
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#include "lib/renderingintent.h"
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namespace Gwenview
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{
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class RasterImageView;
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/**
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* A QGraphicsItem subclass responsible for rendering the main raster image.
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*
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* This class is resposible for painting the main image when it is a raster
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* image. It will get the visible area from the main image, translate and scale
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* this based on the values from the parent ImageView, then apply color
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* correction. Finally the result will be drawn to the screen.
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*
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* For performance, two extra images are cached, one at a third of the image
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* size and one at a sixth. These are used at low zoom levels, to avoid having
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* to copy large amounts of image data that later gets discarded.
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*/
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class RasterImageItem : public QGraphicsItem
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{
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public:
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RasterImageItem(RasterImageView *parent);
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~RasterImageItem() override;
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/**
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* Set the rendering intent for color correction.
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*/
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void setRenderingIntent(RenderingIntent::Enum intent);
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/**
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* Update the internal, smaller cached versions of the main image.
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*/
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void updateCache();
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/**
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* Reimplemented from QGraphicsItem::paint
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*/
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virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
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/**
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* Reimplemented from QGraphicsItem::boundingRect
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*/
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virtual QRectF boundingRect() const override;
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private:
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void applyDisplayTransform(QImage &image);
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void updateDisplayTransform(QImage::Format format);
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RasterImageView *mParentView;
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bool mApplyDisplayTransform = true;
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cmsHTRANSFORM mDisplayTransform = nullptr;
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cmsUInt32Number mRenderingIntent = INTENT_PERCEPTUAL;
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QImage mOriginalImage;
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QImage mThirdScaledImage;
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QImage mSixthScaledImage;
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};
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}
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#endif // RASTERIMAGEITEM_H
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