kiconthemes/autotests/kiconengine_scaled_unittest.cpp

0001 /*
0002     SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
0003
0004     SPDX-License-Identifier: LGPL-2.0-or-later
0005 */
0006
0007 #include <QImageReader>
0008 #include <QStandardPaths>
0009 #include <QTest>
0010
0011 #include <KIconEngine>
0012 #include <KIconLoader>
0013
0014 static int setupEnvBeforeQApplication = []() {
0015     qunsetenv("QT_SCREEN_SCALE_FACTORS");
0016     qputenv("QT_SCALE_FACTOR", "2.0");
0017     return 1;
0018 }();
0019
0020 class KIconEngine_Scaled_UnitTest : public QObject
0021 {
0022     Q_OBJECT
0023
0024 private Q_SLOTS:
0025     void initTestCase()
0026     {
0027         QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
0028         QStandardPaths::setTestModeEnabled(true);
0029     }
0030
0031     void testCenterIcon()
0032     {
0033         QIcon icon(new KIconEngine(QStringLiteral(":/test-22x22.png"), KIconLoader::global()));
0034         QVERIFY(!icon.isNull());
0035
0036         QWindow w;
0037         QCOMPARE(w.devicePixelRatio(), 2.0);
0038         auto image = icon.pixmap(&w, QSize(22, 22)).toImage();
0039         QCOMPARE(image.devicePixelRatio(), 2.0);
0040         QCOMPARE(image.size(), QSize(44, 44));
0041
0042         QImageReader reader(QStringLiteral(":/test-22x22.png"));
0043         reader.setScaledSize(QSize(44, 44));
0044         QImage unscaled = reader.read();
0045         QVERIFY(!unscaled.isNull());
0046         QCOMPARE(unscaled.size(), QSize(44, 44));
0047         unscaled.setDevicePixelRatio(2.0);
0048         QCOMPARE(image, unscaled);
0049
0050         // center vertically
0051         QVERIFY(icon.pixmap(&w, QSize(22, 26)).toImage().copy(0, 4, 44, 44) == image);
0052         // center horizontally
0053         QVERIFY(icon.pixmap(&w, QSize(26, 22)).toImage().copy(4, 0, 44, 44) == image);
0054     }
0055 };
0056
0057 QTEST_MAIN(KIconEngine_Scaled_UnitTest)
0058
0059 #include "kiconengine_scaled_unittest.moc"