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Auto-test some high-dpi env variables 

Add auto-tests for QT_SCALE_FACTOR and QT_SCREEN_SCALE_FACTORS

Change-Id: I57bffa266be910f2ba26cb1a870e09ae202fcae0
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb10
Morten Johan Sørvig 2021-03-10 14:30:31 +01:00
parent 657284acbc
commit f0bf7667a9
1 changed files with 49 additions and 0 deletions
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49
tests/auto/gui/kernel/qhighdpi/tst_qhighdpi.cpp
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@ -47,12 +47,15 @@ private: // helpers
static void standardScreenDpiTestData();
private slots:
void initTestCase();
void cleanup();
void qhighdpiscaling_data();
void qhighdpiscaling();
void minimumDpr();
void noscreens();
void screenDpiAndDpr_data();
void screenDpiAndDpr();
void environment_QT_SCALE_FACTOR();
void environment_QT_SCREEN_SCALE_FACTORS();
void screenAt_data();
void screenAt();
void screenGeometry_data();
@ -178,6 +181,14 @@ void tst_QHighDpi::initTestCase()
#endif
}
void tst_QHighDpi::cleanup()
{
// Some test functions set environment variables. Unset them here,
// in order to avoid getting confusing follow-on errors on test failures.
qunsetenv("QT_SCALE_FACTOR");
qunsetenv("QT_SCREEN_SCALE_FACTORS");
}
void tst_QHighDpi::qhighdpiscaling_data()
{
standardScreenDpiTestData();
@ -224,6 +235,44 @@ void tst_QHighDpi::screenDpiAndDpr()
}
}
void tst_QHighDpi::environment_QT_SCALE_FACTOR()
{
qreal factor = 3.1415;
qputenv("QT_SCALE_FACTOR", QByteArray::number(factor));
QList<qreal> dpiValues { 96, 144, 192 };
std::unique_ptr<QGuiApplication> app(createStandardOffscreenApp(dpiValues));
int i = 0;
for (QScreen *screen : app->screens()) {
// Verify that QT_SCALE_FACTOR applies as a multiplicative factor.
qreal expextedDpr = (dpiValues[i] / standardBaseDpi) * factor;
++i;
QCOMPARE(screen->devicePixelRatio(), expextedDpr);
QCOMPARE(screen->logicalDotsPerInch(), 96);
QWindow window(screen);
QCOMPARE(window.devicePixelRatio(), expextedDpr);
}
}
void tst_QHighDpi::environment_QT_SCREEN_SCALE_FACTORS()
{
qreal factors[] = {1, 1.5, 2};
qputenv("QT_SCREEN_SCALE_FACTORS", "1;1.5;2");
QList<qreal> dpiValues { 192, 216, 240 };
std::unique_ptr<QGuiApplication> app(createStandardOffscreenApp(dpiValues));
int i = 0;
for (QScreen *screen : app->screens()) {
qreal expextedDpr = factors[i];
++i;
// Verify that setting QT_SCREEN_SCALE_FACTORS overrides the from-dpi DPR
QCOMPARE(screen->devicePixelRatio(), expextedDpr);
QCOMPARE(screen->logicalDotsPerInch(), 96);
QWindow window(screen);
QCOMPARE(window.devicePixelRatio(), expextedDpr);
}
}
void tst_QHighDpi::minimumDpr()
{
QList<qreal> dpiValues { 40, 60, 95 };