DPI Detection support

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

3 files changed, 27 insertions, 3 deletions

diff --git a/platform/windows/detect.py b/platform/windows/detect.py
index 97d2461e58..795c49a7f5 100644
--- a/platform/windows/detect.py
+++ b/platform/windows/detect.py
@@ -243,7 +243,7 @@ def configure(env):
 		env.Append(CCFLAGS=['/DGLES2_ENABLED'])
 
 		env.Append(CCFLAGS=['/DGLEW_ENABLED'])
-		LIBS=['winmm','opengl32','dsound','kernel32','ole32','oleaut32','user32','gdi32', 'IPHLPAPI','Shlwapi', 'wsock32', 'shell32','advapi32','dinput8','dxguid']
+		LIBS=['winmm','opengl32','dsound','kernel32','ole32','oleaut32','user32','gdi32', 'IPHLPAPI','Shcore','Shlwapi', 'wsock32', 'shell32','advapi32','dinput8','dxguid']
 		env.Append(LINKFLAGS=[p+env["LIBSUFFIX"] for p in LIBS])
 
 		env.Append(LIBPATH=[os.getenv("WindowsSdkDir")+"/Lib"])
@@ -370,7 +370,7 @@ def configure(env):
 		env.Append(CCFLAGS=['-DWINDOWS_ENABLED','-mwindows'])
 		env.Append(CPPFLAGS=['-DRTAUDIO_ENABLED'])
 		env.Append(CCFLAGS=['-DGLES2_ENABLED','-DGLEW_ENABLED'])
-		env.Append(LIBS=['mingw32','opengl32', 'dsound', 'ole32', 'd3d9','winmm','gdi32','iphlpapi','shlwapi','wsock32','kernel32', 'oleaut32', 'dinput8', 'dxguid'])
+		env.Append(LIBS=['mingw32','opengl32', 'dsound', 'ole32', 'd3d9','winmm','gdi32','iphlpapi','shlwapi','wsock32','shcore','kernel32', 'oleaut32', 'dinput8', 'dxguid'])
 
 		# if (env["bits"]=="32"):
 			# env.Append(LIBS=['gcc_s'])
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;
diff --git a/platform/windows/os_windows.h b/platform/windows/os_windows.h
index 810da1b3cd..6dd5b78bfd 100644
--- a/platform/windows/os_windows.h
+++ b/platform/windows/os_windows.h
@@ -172,6 +172,7 @@ protected:
 		HMONITOR hMonitor;
 		HDC hdcMonitor;
 		Rect2 rect;
+		int dpi;
 
 
 	};
@@ -213,6 +214,8 @@ public:
 	virtual void set_current_screen(int p_screen);
 	virtual Point2 get_screen_position(int p_screen=0) const;
 	virtual Size2 get_screen_size(int p_screen=0) const;
+	virtual int get_screen_dpi(int p_screen=0) const;
+
 	virtual Point2 get_window_position() const;
 	virtual void set_window_position(const Point2& p_position);
 	virtual Size2 get_window_size() const;