More mouse and PIC fixes and the mouse now takes of the ration between guest resolution and actual render area size, multiplied by the DPI, when returning coordinate deltas, also unified the delta return function across the various emulated mice.

src/qt/qt_platform.cpp

@@ -42,9 +42,12 @@
 #include <QLibrary>
 #include <QElapsedTimer>
 
+#include <QScreen>
+
 #include "qt_rendererstack.hpp"
 #include "qt_mainwindow.hpp"
 #include "qt_progsettings.hpp"
+#include "qt_util.hpp"
 
 #ifdef Q_OS_UNIX
 #    include <sys/mman.h>
@@ -641,7 +644,7 @@ plat_get_global_config_dir(char* strptr)
 }
 
 void
-plat_init_rom_paths()
+plat_init_rom_paths(void)
 {
     auto paths = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
 
@@ -727,4 +730,10 @@ plat_get_cpu_string(char *outbuf, uint8_t len) {
 
     qstrncpy(outbuf, cpu_string.toUtf8().constData(), len);
 
-}
+}
+
+double
+plat_get_dpi(void)
+{
+    return util::screenOfWidget(main_window)->devicePixelRatio();
+}