#include "frontends/Application.h"
#include "support/ConsoleApplication.h"
+#include "support/convert.h"
#include "support/lassert.h"
#include "support/debug.h"
#include "support/environment.h"
#include <string>
#include <vector>
+#include <qglobal.h> // For QT_VERSION
+
using namespace std;
using namespace lyx::support;
OverwriteFiles force_overwrite = UNSPECIFIED;
+// Scale the GUI by this factor. This works whether we have a HiDpi screen
+// or not and scales everything, also fonts. Can only be changed by setting
+// the QT_SCALE_FACTOR environment variable before launching LyX and only
+// works properly with Qt 5.6 or higher.
+
+double qt_scale_factor = 1.0;
+
+
namespace {
// Filled with the command line arguments "foo" of "-sysdir foo" or
// we need to parse for "-dbg" and "-help"
easyParse(argc, argv);
+#if QT_VERSION >= 0x050600
+ // Check whether Qt will scale all GUI elements and accordingly
+ // set the scale factor so that to avoid blurred images and text
+ char const * const scale_factor = getenv("QT_SCALE_FACTOR");
+ if (scale_factor) {
+ qt_scale_factor = convert<double>(scale_factor);
+ if (qt_scale_factor < 1.0)
+ qt_scale_factor = 1.0;
+ }
+#endif
+
try {
init_package(os::utf8_argv(0), cl_system_support, cl_user_support);
} catch (ExceptionMessage const & message) {