From 4041ff10f50d4b6dc5c14b18f180b2738cbbadd0 Mon Sep 17 00:00:00 2001
From: Jaakko Keränen <jaakko.keranen@iki.fi>
Date: Wed, 30 Sep 2020 15:12:21 +0300
Subject: Windows: Initial/minimum window size vs. UI scale factor

---
 src/win32.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/win32.c')

diff --git a/src/win32.c b/src/win32.c
index 36043b53..5eb2a0d5 100644
--- a/src/win32.c
+++ b/src/win32.c
@@ -25,11 +25,28 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
+#include <d2d1.h>
 
 void setDPIAware_Win32(void) {
     SetProcessDPIAware();
 }
 
+float desktopDPI_Win32(void) {
+    /* Query Direct2D for the desktop DPI (not aware of which monitor, though). */
+    float ratio = 1.0f;
+    ID2D1Factory *d2dFactory = NULL;
+    HRESULT hr = D2D1CreateFactory(
+        D2D1_FACTORY_TYPE_SINGLE_THREADED, &IID_ID2D1Factory, NULL, (void **) &d2dFactory);
+    if (SUCCEEDED(hr)) {
+        FLOAT dpiX = 96;
+        FLOAT dpiY = 96;
+        ID2D1Factory_GetDesktopDpi(d2dFactory, &dpiX, &dpiY);
+        ratio = (float) (dpiX / 96.0);
+        ID2D1Factory_Release(d2dFactory);
+    }
+    return ratio;
+}
+
 void useExecutableIconResource_SDLWindow(SDL_Window *win) {
     HINSTANCE handle = GetModuleHandle(NULL);
     HICON icon = LoadIcon(handle, "IDI_ICON1");
-- 
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