imagepreview.cpp

/*
 *  This file is part of the KDE libraries
 *  Copyright (c) 2001 Michael Goffioul <tdeprint@swing.be>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/
 
#include "imagepreview.h"
 
#include <tqpainter.h>
#include <tqpixmap.h>
#include <tqpaintdevice.h>
 
// forward definition
TQImage convertImage(const TQImage& image, int hue, int saturation, int brightness, int gamma);
 
ImagePreview::ImagePreview(TQWidget *parent, const char *name ) : TQWidget(parent,name) {
    brightness_ = 100;
    hue_ = 0;
    saturation_ = 100;
    gamma_ = 1000;
    bw_ = false;
 
    setBackgroundMode(NoBackground);
}
 
ImagePreview::~ImagePreview(){
}
 
void ImagePreview::setImage(const TQImage& image){
    image_ = image.convertDepth(32);
    image_.detach();
    resize(image_.size());
    update();
}
 
void ImagePreview::setParameters(int brightness, int hue, int saturation, int gamma){
    brightness_ = brightness;
    hue_ = hue;
    saturation_ = saturation;
    gamma_ = gamma;
    repaint();
}
 
void ImagePreview::paintEvent(TQPaintEvent*){
    TQImage tmpImage = convertImage(image_,hue_,(bw_ ? 0 : saturation_),brightness_,gamma_);
    int x = (width()-tmpImage.width())/2, y = (height()-tmpImage.height())/2;
 
    TQPixmap    buffer(width(), height());
    buffer.fill(parentWidget(), 0, 0);
    TQPainter   p(&buffer);
    p.drawImage(x,y,tmpImage);
    p.end();
 
    bitBlt(this, TQPoint(0, 0), &buffer, buffer.rect(), TQt::CopyROP);
}
 
void ImagePreview::setBlackAndWhite(bool on){
    bw_ = on;
    update();
}
 
TQSize ImagePreview::minimumSizeHint() const
{
    return image_.size();
}