imagepreview.cpp
/*
* This file is part of the KDE libraries
* Copyright (c) 2001 Michael Goffioul <kdeprint@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 <qpainter.h>
#include <qpixmap.h>
#include <qpaintdevice.h>
// forward definition
QImage convertImage(const QImage& image, int hue, int saturation, int brightness, int gamma);
ImagePreview::ImagePreview(QWidget *parent, const char *name ) : QWidget(parent,name) {
brightness_ = 100;
hue_ = 0;
saturation_ = 100;
gamma_ = 1000;
bw_ = false;
setBackgroundMode(NoBackground);
}
ImagePreview::~ImagePreview(){
}
void ImagePreview::setImage(const QImage& 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(QPaintEvent*){
QImage tmpImage = convertImage(image_,hue_,(bw_ ? 0 : saturation_),brightness_,gamma_);
int x = (width()-tmpImage.width())/2, y = (height()-tmpImage.height())/2;
QPixmap buffer(width(), height());
buffer.fill(parentWidget(), 0, 0);
QPainter p(&buffer);
p.drawImage(x,y,tmpImage);
p.end();
bitBlt(this, QPoint(0, 0), &buffer, buffer.rect(), Qt::CopyROP);
}
void ImagePreview::setBlackAndWhite(bool on){
bw_ = on;
update();
}
QSize ImagePreview::minimumSizeHint() const
{
return image_.size();
}

KDE Home | KDE Accessibility Home | Description of Access Keys