Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

extrafiltersplugin.cpp Example File
tools/plugandpaintplugins/extrafilters/extrafiltersplugin.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 as published by the Free
 ** Software Foundation and appearing in the file LICENSE.GPL included in
 ** the packaging of this file.  Please review the following information
 ** to ensure GNU General Public Licensing requirements will be met:
 ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #include <QtGui>

 #include <math.h>
 #include <stdlib.h>

 #include "extrafiltersplugin.h"

 QStringList ExtraFiltersPlugin::filters() const
 {
     return QStringList() << tr("Flip Horizontally") << tr("Flip Vertically")
                          << tr("Smudge...") << tr("Threshold...");
 }

 QImage ExtraFiltersPlugin::filterImage(const QString &filter,
                                        const QImage &image, QWidget *parent)
 {
     QImage original = image.convertToFormat(QImage::Format_RGB32);
     QImage result = original;

     if (filter == tr("Flip Horizontally")) {
         for (int y = 0; y < original.height(); ++y) {
             for (int x = 0; x < original.width(); ++x) {
                 int pixel = original.pixel(original.width() - x - 1, y);
                 result.setPixel(x, y, pixel);
             }
         }
     } else if (filter == tr("Flip Vertically")) {
         for (int y = 0; y < original.height(); ++y) {
             for (int x = 0; x < original.width(); ++x) {
                 int pixel = original.pixel(x, original.height() - y - 1);
                 result.setPixel(x, y, pixel);
             }
         }
     } else if (filter == tr("Smudge...")) {
         bool ok;
         int numIters = QInputDialog::getInteger(parent, tr("Smudge Filter"),
                                     tr("Enter number of iterations:"),
                                     5, 1, 20, 1, &ok);
         if (ok) {
             for (int i = 0; i < numIters; ++i) {
                 for (int y = 1; y < original.height() - 1; ++y) {
                     for (int x = 1; x < original.width() - 1; ++x) {
                         int p1 = original.pixel(x, y);
                         int p2 = original.pixel(x, y + 1);
                         int p3 = original.pixel(x, y - 1);
                         int p4 = original.pixel(x + 1, y);
                         int p5 = original.pixel(x - 1, y);

                         int red = (qRed(p1) + qRed(p2) + qRed(p3) + qRed(p4)
                                    + qRed(p5)) / 5;
                         int green = (qGreen(p1) + qGreen(p2) + qGreen(p3)
                                      + qGreen(p4) + qGreen(p5)) / 5;
                         int blue = (qBlue(p1) + qBlue(p2) + qBlue(p3)
                                     + qBlue(p4) + qBlue(p5)) / 5;
                         int alpha = (qAlpha(p1) + qAlpha(p2) + qAlpha(p3)
                                      + qAlpha(p4) + qAlpha(p5)) / 5;

                         result.setPixel(x, y, qRgba(red, green, blue, alpha));
                     }
                 }
             }
         }
     } else if (filter == tr("Threshold...")) {
         bool ok;
         int threshold = QInputDialog::getInteger(parent, tr("Threshold Filter"),
                                                  tr("Enter threshold:"),
                                                  10, 1, 256, 1, &ok);
         if (ok) {
             int factor = 256 / threshold;
             for (int y = 0; y < original.height(); ++y) {
                 for (int x = 0; x < original.width(); ++x) {
                     int pixel = original.pixel(x, y);
                     result.setPixel(x, y, qRgba(qRed(pixel) / factor * factor,
                                                 qGreen(pixel) / factor * factor,
                                                 qBlue(pixel) / factor * factor,
                                                 qAlpha(pixel)));
                 }
             }
         }
     }
     return result;
 }

 Q_EXPORT_PLUGIN2(pnp_extrafilters, ExtraFiltersPlugin)


Copyright © 2008 Nokia Trademarks
Qt 4.4.3