imagepreview.cpp

00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be>
00004  *
00005  *  This library is free software; you can redistribute it and/or
00006  *  modify it under the terms of the GNU Library General Public
00007  *  License version 2 as published by the Free Software Foundation.
00008  *
00009  *  This library is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  *  Library General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Library General Public License
00015  *  along with this library; see the file COPYING.LIB.  If not, write to
00016  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  **/
00019 
00020 #include "imagepreview.h"
00021 
00022 #include <qpainter.h>
00023 #include <qpixmap.h>
00024 #include <qpaintdevice.h>
00025 
00026 // forward definition
00027 QImage convertImage(const QImage& image, int hue, int saturation, int brightness, int gamma);
00028 
00029 ImagePreview::ImagePreview(QWidget *parent, const char *name ) : QWidget(parent,name) {
00030     brightness_ = 100;
00031     hue_ = 0;
00032     saturation_ = 100;
00033     gamma_ = 1000;
00034     bw_ = false;
00035 
00036     setBackgroundMode(NoBackground);
00037 }
00038 
00039 ImagePreview::~ImagePreview(){
00040 }
00041 
00042 void ImagePreview::setImage(const QImage& image){
00043     image_ = image.convertDepth(32);
00044     image_.detach();
00045     resize(image_.size());
00046     update();
00047 }
00048 
00049 void ImagePreview::setParameters(int brightness, int hue, int saturation, int gamma){
00050     brightness_ = brightness;
00051     hue_ = hue;
00052     saturation_ = saturation;
00053     gamma_ = gamma;
00054     repaint();
00055 }
00056 
00057 void ImagePreview::paintEvent(QPaintEvent*){
00058     QImage  tmpImage = convertImage(image_,hue_,(bw_ ? 0 : saturation_),brightness_,gamma_);
00059     int x = (width()-tmpImage.width())/2, y = (height()-tmpImage.height())/2;
00060 
00061     QPixmap buffer(width(), height());
00062     buffer.fill(parentWidget(), 0, 0);
00063     QPainter    p(&buffer);
00064     p.drawImage(x,y,tmpImage);
00065     p.end();
00066 
00067     bitBlt(this, QPoint(0, 0), &buffer, buffer.rect(), Qt::CopyROP);
00068 }
00069 
00070 void ImagePreview::setBlackAndWhite(bool on){
00071     bw_ = on;
00072     update();
00073 }
00074 
00075 QSize ImagePreview::minimumSizeHint() const
00076 {
00077     return image_.size();
00078 }
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