DPI Detection support

Windows only for now.
Many builds may break (older visual studio, mingw32)

1 files changed, 22 insertions, 1 deletions

diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index bf8b0ee6b5..8bb5de5d5d 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -57,6 +57,13 @@
 #include <regstr.h>
 #include <process.h>
 
+#if (_MSC_VER >= 1700)
+#define HIDPI_SUPPORT
+#endif
+
+#ifdef HIDPI_SUPPORT
+#include <ShellScalingAPI.h>
+#endif
 static const WORD MAX_CONSOLE_LINES = 1500;
 
 extern "C" {
@@ -854,7 +861,13 @@ BOOL CALLBACK OS_Windows::MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor, LPR
 	minfo.rect.pos.y=lprcMonitor->top;
 	minfo.rect.size.x=lprcMonitor->right - lprcMonitor->left;
 	minfo.rect.size.y=lprcMonitor->bottom - lprcMonitor->top;
-
+#ifdef HIDPI_SUPPORT
+	UINT dpix,dpiy;
+	GetDpiForMonitor(hMonitor,MDT_EFFECTIVE_DPI,&dpix,&dpiy);
+	minfo.dpi=(dpix + dpiy)/2;
+#else
+	minfo.dpi=72;
+#endif
 	self->monitor_info.push_back(minfo);
 
 	return TRUE;
@@ -1366,6 +1379,14 @@ Size2 OS_Windows::get_screen_size(int p_screen) const{
 	return Vector2( monitor_info[p_screen].rect.size );
 
 }
+
+int OS_Windows::get_screen_dpi(int p_screen) const {
+
+	ERR_FAIL_INDEX_V(p_screen,monitor_info.size(),72);
+	UINT dpix,dpiy;
+	return monitor_info[p_screen].dpi;
+
+}
 Point2 OS_Windows::get_window_position() const{
 
 	RECT r;