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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 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 the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "imagecompare.h"
ImageCompare::ImageCompare(QObject *parent) : QObject(parent){
}
bool ImageCompare::ComparePixels(QImage actual, QImage expected, int tolerance, QString filename){
bool result = true;
bool compareAlpha, compareRed, compareGreen, compareBlue;
int diffPixelCount = 0;
QImage diffImage(300, 300, QImage::Format_ARGB32);
diffImage.fill(Qt::white);
for(int y = 0; y < 300; y++){
for(int x = 0; x < 300; x++){
// Pixel difference is set initially to false.
bool diff = false;
// Gets the color of the pixel in the given position.
QRgb pixelActual = actual.pixel(x,y);
QRgb pixelExpected = expected.pixel(x,y);
// Compares separately the alpha, red, green and blue components of an ARGB value within the specified tolerance.
compareAlpha = (abs(qAlpha(pixelActual) - qAlpha(pixelExpected)) <= tolerance);
compareRed = (abs(qRed(pixelActual) - qRed(pixelExpected)) <= tolerance);
compareGreen = (abs(qGreen(pixelActual) - qGreen(pixelExpected)) <= tolerance);
compareBlue = (abs(qBlue(pixelActual) - qBlue(pixelExpected)) <= tolerance);
// Result value holds the overall boolean status are the compared images the same or different.
result &= (compareAlpha && compareRed && compareGreen && compareBlue);
// When the compared pixels differ, diff value is set to true and the pixel position is marked to an additional image file.
diff = !(compareAlpha && compareRed && compareGreen && compareBlue);
if (diff == true){
diffImage.setPixel(x, y, qRgba(255, 0, 0, 255));
++diffPixelCount;
}
}
}
if(result == false){
qDebug() << "The percentage difference in" << filename << ":" << diffPixelCount << "/" << 300*300 << "=" << 100.0*diffPixelCount/(300*300);
QDir wd = QDir().dirName();
wd.mkdir("diffImages");
diffImage.save("diffImages/" + filename);
}
return result;
}
bool ImageCompare::CompareSizes(QImage actual, QImage expected){
bool sizesMatch = true;
if (actual.width() == expected.width() && actual.height() == expected.height()){
sizesMatch = true;
}
else sizesMatch = false;
return sizesMatch;
}
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