AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Deprecate QT_AUTO_SCREEN_SCALE_FACTOR

Browse Source 
Replace by QT_ENABLE_HIGHDPI_SCALING.

QT_AUTO_SCREEN_SCALE_FACTOR has the usability problem that it mixes
enabling the high-DPI scaling mode with the method of getting screen
scale factors (“auto”). Due to this, it ends up with a slightly
strange name.

QT_ENABLE_HIGHDPI_SCALING matches the C++ option
(Qt::AA_EnableHighDPiScaling), and leaves the scale factor acquisition
method unspecified, possibly to be set by some other means (like
QT_SCREEN_SCALE_FACTORS).

Done-with: Friedemann Kleint <Friedemann.Kleint@qt.io>
Task-number: QTBUG-53022
Change-Id: I30033d91175a00db7837efc9c48c33396f5f0449
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
This commit is contained in:
Morten Johan Sørvig 2016-11-10 14:17:53 +01:00
parent 35da4eeba2
commit 1de8b01d2b
1 changed files with 23 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/gui/kernel/qhighdpiscaling.cpp
View File

@ -56,8 +56,10 @@ Q_LOGGING_CATEGORY(lcScaling, "qt.scaling");
#ifndef QT_NO_HIGHDPISCALING
static const char legacyDevicePixelEnvVar[] = "QT_DEVICE_PIXEL_RATIO";
static const char legacyAutoScreenEnvVar[] = "QT_AUTO_SCREEN_SCALE_FACTOR";
static const char enableHighDpiScalingEnvVar[] = "QT_ENABLE_HIGHDPI_SCALING";
static const char scaleFactorEnvVar[] = "QT_SCALE_FACTOR";
static const char autoScreenEnvVar[] = "QT_AUTO_SCREEN_SCALE_FACTOR";
static const char screenFactorsEnvVar[] = "QT_SCREEN_SCALE_FACTORS";
static const char scaleFactorRoundingPolicyEnvVar[] = "QT_SCALE_FACTOR_ROUNDING_POLICY";
static const char dpiAdjustmentPolicyEnvVar[] = "QT_DPI_ADJUSTMENT_POLICY";
@ -90,17 +92,24 @@ static inline qreal initialGlobalScaleFactor()
result = f;
}
} else {
// Check for deprecated environment variables.
if (qEnvironmentVariableIsSet(legacyDevicePixelEnvVar)) {
qWarning("Warning: %s is deprecated. Instead use:\n"
" %s to enable platform plugin controlled per-screen factors.\n"
" %s to set per-screen factors.\n"
" %s to set per-screen DPI.\n"
" %s to set the application global scale factor.",
legacyDevicePixelEnvVar, autoScreenEnvVar, screenFactorsEnvVar, scaleFactorEnvVar);
legacyDevicePixelEnvVar, legacyAutoScreenEnvVar, screenFactorsEnvVar, scaleFactorEnvVar);
int dpr = qEnvironmentVariableIntValue(legacyDevicePixelEnvVar);
if (dpr > 0)
result = dpr;
}
if (qEnvironmentVariableIsSet(legacyAutoScreenEnvVar)) {
qWarning("Warning: %s is deprecated. Instead use:\n"
" %s to enable platform plugin controlled per-screen factors.",
legacyAutoScreenEnvVar, enableHighDpiScalingEnvVar);
}
}
return result;
}
@ -258,16 +267,24 @@ static inline bool usePixelDensity()
// Determine if we should set a scale factor based on the pixel density
// reported by the platform plugin. There are several enablers and several
// disablers. A single disable may veto all other enablers.
// First, check of there is an explicit disable.
if (QCoreApplication::testAttribute(Qt::AA_DisableHighDpiScaling))
return false;
bool screenEnvValueOk;
const int screenEnvValue = qEnvironmentVariableIntValue(autoScreenEnvVar, &screenEnvValueOk);
const int screenEnvValue = qEnvironmentVariableIntValue(legacyAutoScreenEnvVar, &screenEnvValueOk);
if (screenEnvValueOk && screenEnvValue < 1)
return false;
bool enableEnvValueOk;
const int enableEnvValue = qEnvironmentVariableIntValue(enableHighDpiScalingEnvVar, &enableEnvValueOk);
if (enableEnvValueOk && enableEnvValue < 1)
return false;
// Then return if there was an enable.
return QCoreApplication::testAttribute(Qt::AA_EnableHighDpiScaling)
|| (screenEnvValueOk && screenEnvValue > 0)
|| (qEnvironmentVariableIsSet(legacyDevicePixelEnvVar) &&
qgetenv(legacyDevicePixelEnvVar).compare("auto", Qt::CaseInsensitive) == 0);
|| (enableEnvValueOk && enableEnvValue > 0)
|| (qEnvironmentVariableIsSet(legacyDevicePixelEnvVar) && qgetenv(legacyDevicePixelEnvVar).toLower() == "auto");
}
qreal QHighDpiScaling::rawScaleFactor(const QPlatformScreen *screen)