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App: Set QPixmapCache limit according to devicePixelRatio

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Higher resolution also means more data to be cached. The default 10MB
cache limit don't cut it in HighDpi, especially in cache-intensive parts
like the welcome screen.

Change-Id: I653a939c3a37f80647d73e8de8df616d5386e39c
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
This commit is contained in:
Alessandro Portale
2022-07-20 12:21:52 +02:00
parent 212c5b09b9
commit d4643a627b
1 changed files with 10 additions and 0 deletions
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10
src/app/main.cpp
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@@ -63,6 +63,7 @@
#include <QApplication> #include <QApplication>
#include <QMessageBox> #include <QMessageBox>
#include <QPixmapCache>
#include <QProcess> #include <QProcess>
#include <QStandardPaths> #include <QStandardPaths>
#include <QTemporaryDir> #include <QTemporaryDir>
@@ -294,6 +295,14 @@ static void setHighDpiEnvironmentVariable()
} }
} }
void setPixmapCacheLimit()
{
const int originalLimit = QPixmapCache::cacheLimit();
const qreal dpr = qApp->devicePixelRatio();
const qreal multiplier = std::clamp(dpr * dpr, 1.0, 4.0);
QPixmapCache::setCacheLimit(originalLimit * multiplier);
}
void loadFonts() void loadFonts()
{ {
const QDir dir(resourcePath() + "/fonts/"); const QDir dir(resourcePath() + "/fonts/");
@@ -562,6 +571,7 @@ int main(int argc, char **argv)
QLatin1String(Core::Constants::IDE_SETTINGSVARIANT_STR), QLatin1String(Core::Constants::IDE_SETTINGSVARIANT_STR),
QLatin1String(Core::Constants::IDE_CASED_ID)); QLatin1String(Core::Constants::IDE_CASED_ID));
Utils::TerminalCommand::setSettings(settings); Utils::TerminalCommand::setSettings(settings);
setPixmapCacheLimit();
loadFonts(); loadFonts();
if (Utils::HostOsInfo::isWindowsHost() if (Utils::HostOsInfo::isWindowsHost()