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Qt: Properly set QT_SCALE_FACTOR_ROUNDING_POLICY

This commit is contained in:
Megamouse 2021-03-29 19:20:51 +02:00
parent 90ac24e524
commit d62983e1a2
1 changed files with 41 additions and 28 deletions
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69
rpcs3/main.cpp
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@ -14,6 +14,7 @@
#include <QJsonObject>
#include <QJsonDocument>
#include <QMessageBox>
#include <QMetaEnum>
#include "rpcs3qt/gui_application.h"
#include "rpcs3qt/fatal_error_dialog.h"
@ -257,48 +258,60 @@ QCoreApplication* createApplication(int& argc, char* argv[])
if (use_high_dpi)
{
// Set QT_SCALE_FACTOR_ROUNDING_POLICY from environment. Defaults to cli argument, which defaults to RoundPreferFloor.
auto rounding_val = Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
auto rounding_str = std::to_string(static_cast<int>(rounding_val));
const int i_rounding = find_arg(arg_rounding, argc, argv);
// Set QT_SCALE_FACTOR_ROUNDING_POLICY from environment. Defaults to cli argument, which defaults to PassThrough.
Qt::HighDpiScaleFactorRoundingPolicy rounding_val = Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
const QMetaEnum meta_enum = QMetaEnum::fromType<Qt::HighDpiScaleFactorRoundingPolicy>();
QString rounding_str_cli = meta_enum.valueToKey(static_cast<int>(rounding_val));
if (i_rounding != -1)
const auto check_dpi_rounding_arg = [&rounding_str_cli, &rounding_val, &meta_enum](const char* val) -> bool
{
const int i_rounding_2 = (argc > (i_rounding + 1)) ? (i_rounding + 1) : 0;
bool ok{false};
if (i_rounding_2)
// Try to find out if the argument is a valid string representation of Qt::HighDpiScaleFactorRoundingPolicy
if (const int enum_index = meta_enum.keyToValue(val, &ok); ok)
{
const auto arg_val = argv[i_rounding_2];
//const auto arg_len = std::strlen(arg_val);
s64 rounding_val_cli = 0;
if (!cfg::try_to_int64(&rounding_val_cli, arg_val, static_cast<int>(Qt::HighDpiScaleFactorRoundingPolicy::Unset), static_cast<int>(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough)))
rounding_str_cli = meta_enum.valueToKey(enum_index);
rounding_val = static_cast<Qt::HighDpiScaleFactorRoundingPolicy>(enum_index);
}
// Try to find out if the argument is a valid integer representation of Qt::HighDpiScaleFactorRoundingPolicy
else if (const int enum_index = QString(val).toInt(&ok); ok)
{
if (const char* key = meta_enum.valueToKey(enum_index))
{
std::cout << "The value " << arg_val << " for " << arg_rounding << " is not allowed. Please use a valid value for Qt::HighDpiScaleFactorRoundingPolicy.\n";
rounding_str_cli = key;
rounding_val = static_cast<Qt::HighDpiScaleFactorRoundingPolicy>(enum_index);
}
else
{
rounding_val = static_cast<Qt::HighDpiScaleFactorRoundingPolicy>(static_cast<int>(rounding_val_cli));
rounding_str = std::to_string(static_cast<int>(rounding_val));
return false;
}
}
return ok;
};
if (const int i_rounding = find_arg(arg_rounding, argc, argv); i_rounding != -1)
{
if (const int i_rounding_2 = (argc > (i_rounding + 1)) ? (i_rounding + 1) : 0; i_rounding_2)
{
if (const auto arg_val = argv[i_rounding_2]; !check_dpi_rounding_arg(arg_val))
{
const std::string msg = fmt::format("The command line value %s for %s is not allowed. Please use a valid value for Qt::HighDpiScaleFactorRoundingPolicy.", arg_val, arg_rounding);
sys_log.error("%s", msg); // Don't exit with fatal error. The resulting dialog might be unreadable with dpi problems.
std::cerr << msg << std::endl;
}
}
}
// Get the environment variable. Fallback to cli argument.
rounding_str_cli = qEnvironmentVariable("QT_SCALE_FACTOR_ROUNDING_POLICY", rounding_str_cli);
if (!check_dpi_rounding_arg(rounding_str_cli.toStdString().c_str()))
{
rounding_str = qEnvironmentVariable("QT_SCALE_FACTOR_ROUNDING_POLICY", rounding_str.c_str()).toStdString();
s64 rounding_val_final = 0;
if (cfg::try_to_int64(&rounding_val_final, rounding_str, static_cast<int>(Qt::HighDpiScaleFactorRoundingPolicy::Unset), static_cast<int>(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough)))
{
rounding_val = static_cast<Qt::HighDpiScaleFactorRoundingPolicy>(static_cast<int>(rounding_val_final));
rounding_str = std::to_string(static_cast<int>(rounding_val));
}
else
{
std::cout << "The value " << rounding_str << " for " << arg_rounding << " is not allowed. Please use a valid value for Qt::HighDpiScaleFactorRoundingPolicy.\n";
}
const std::string msg = fmt::format("The value %s for the environment variable QT_SCALE_FACTOR_ROUNDING_POLICY is not allowed. Please use a valid value for Qt::HighDpiScaleFactorRoundingPolicy.", rounding_str_cli.toStdString());
sys_log.error("%s", msg); // Don't exit with fatal error. The resulting dialog might be unreadable with dpi problems.
std::cerr << msg << std::endl;
}
QApplication::setHighDpiScaleFactorRoundingPolicy(rounding_val);
}