imageprocessor.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
** 
** 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.
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** A copy of the GNU GPL license version 2 is included in this package as 
** LICENSE.GPL.
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** 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.
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** the code of this program with Qtopia applications copyrighted, developed
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#ifndef IMAGEPROCESSOR_H
#define IMAGEPROCESSOR_H

#include "matrix.h"

#include <qobject.h>
#include <qpoint.h>
#include <qsize.h>
#include <qpixmap.h>
#include <qimage.h>

class ImageIO;

class ImageProcessor : public QObject {
    Q_OBJECT
public:
    ImageProcessor( ImageIO*, QObject* parent = 0, const char* name = 0 );
    
    // Crop image to area within rect
    void crop( const QRect& );
    
    // Return point on transformed image given point on original
    QPoint map( const QPoint& ) const;
    
    // Return point on original image given point on transformed
    QPoint unmap( const QPoint& ) const;
    
    // Return a preview of the image with transformations applied at rect
    const QPixmap& preview( const QRect& rect ) const;
    
    // Return the image with transformations applied
    QImage image() const;
    
    // Return the image with transformation applied scaled to within size
    // The width to height ratio of the transformed image is preserved
    QImage image( const QSize& size ) const;
    
    // Return size of image with the current transformations applied
    QSize size() const;
    
    // Return true if transformed image is different from original
    bool isChanged() const;
    
signals:
    // Image has changed
    void changed();
    
public slots:
    // Set zoom factor for image
    // factor    0 < value
    void setZoom( double factor );

    // Set brightness factor for the image
    // factor    0 <= value <= 1
    void setBrightness( double factor );
    
    // Rotate image clockwise 90 degrees
    void rotate();
    
private slots:
    // Reset transformations
    void reset();

private:
    // Return rect on transformed image given rect on original
    QRect map( const QRect& ) const;

    // Return rect on original image given rect on transformed
    QRect unmap( const QRect& ) const;
    
    QImage transform( const QImage&, const QRect& ) const;

    ImageIO *image_io;
    
    QRect viewport;
    
    double brightness_factor;
    double zoom_factor;
    Matrix transformation_matrix;
    
    mutable QPixmap _preview;
};

#endif