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app: Setting HighDPI environment variables

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After b42bd585c4 there was
no automatic scaling of Qt Creator's UI with Qt 5.6 on non-OSX,
anymore.

This commit re-introduces it for Windows.

As a small bonus, now the environment variable is only set during
QApplication creation and unset afterwards. The run environments
are now not affected, anymore.

Change-Id: If0039df500d28a93c1ca8c2df9960992a010723f
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
This commit is contained in:
Alessandro Portale
2015-11-03 16:00:10 +01:00
parent 2b16b97f19
commit f4e5210cda
1 changed files with 28 additions and 6 deletions
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34
src/app/main.cpp
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@@ -159,6 +159,30 @@ static inline int askMsgSendFailed()
QMessageBox::Retry);
}
static const char* setHighDpiEnvirnonmentVariable()
{
const char* envVarName = 0;
static const char ENV_VAR_QT_DEVICE_PIXEL_RATIO[] = "QT_DEVICE_PIXEL_RATIO";
#if (QT_VERSION < QT_VERSION_CHECK(5, 6, 0))
if (Utils::HostOsInfo().isWindowsHost()
&& !qEnvironmentVariableIsSet(ENV_VAR_QT_DEVICE_PIXEL_RATIO)) {
envVarName = ENV_VAR_QT_DEVICE_PIXEL_RATIO;
qputenv(envVarName, "auto");
}
#else
static const char ENV_VAR_QT_AUTO_SCREEN_SCALE_FACTOR[] = "QT_AUTO_SCREEN_SCALE_FACTOR";
if (Utils::HostOsInfo().isWindowsHost()
&& !qEnvironmentVariableIsSet(ENV_VAR_QT_DEVICE_PIXEL_RATIO) // legacy in 5.6, but still functional
&& !qEnvironmentVariableIsSet(ENV_VAR_QT_AUTO_SCREEN_SCALE_FACTOR)
&& !qEnvironmentVariableIsSet("QT_SCALE_FACTOR")
&& !qEnvironmentVariableIsSet("QT_SCREEN_SCALE_FACTORS")) {
envVarName = ENV_VAR_QT_AUTO_SCREEN_SCALE_FACTOR;
qputenv(envVarName, "true");
}
#endif // < Qt 5.6
return envVarName;
}
// taken from utils/fileutils.cpp. We can not use utils here since that depends app_version.h.
static bool copyRecursively(const QString &srcFilePath,
const QString &tgtFilePath)
@@ -280,12 +304,7 @@ static const char *SHARE_PATH =
int main(int argc, char **argv)
{
#if (QT_VERSION < QT_VERSION_CHECK(5, 6, 0))
if (Utils::HostOsInfo().isWindowsHost()
&& !qEnvironmentVariableIsSet("QT_DEVICE_PIXEL_RATIO")) {
qputenv("QT_DEVICE_PIXEL_RATIO", "auto");
}
#endif // < Qt 5.6
const char *highDpiEnvironmentVariable = setHighDpiEnvirnonmentVariable();
QLoggingCategory::setFilterRules(QLatin1String("qtc.*.debug=false"));
#ifdef Q_OS_MAC
@@ -299,6 +318,9 @@ int main(int argc, char **argv)
SharedTools::QtSingleApplication app((QLatin1String(appNameC)), argc, argv);
if (highDpiEnvironmentVariable)
qunsetenv(highDpiEnvironmentVariable);
if (Utils::HostOsInfo().isWindowsHost()
&& !qFuzzyCompare(qApp->devicePixelRatio(), 1.0)
&& QApplication::style()->objectName().startsWith(