From b9f52ef416ff38c5dd60bd2c5b355078b29b9556 Mon Sep 17 00:00:00 2001
From: Andrew <andrew.pa@outlook.com>
Date: Sat, 3 Sep 2016 13:52:20 -0700
Subject: [PATCH] fixed Windows HiDPI support (#184)

---
 windows/colorbutton.cpp | 9 +++++++++
 windows/init.cpp        | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/windows/colorbutton.cpp b/windows/colorbutton.cpp
index c1ba6954..7f63110e 100644
--- a/windows/colorbutton.cpp
+++ b/windows/colorbutton.cpp
@@ -61,7 +61,9 @@ static BOOL onWM_NOTIFY(uiControl *c, HWND hwnd, NMHDR *nmhdr, LRESULT *lResult)
 	ID2D1SolidColorBrush *brush;
 	uiWindowsSizing sizing;
 	int x, y;
+	float dpi_x, dpi_y;
 	HRESULT hr;
+	D2D1_MATRIX_3X2_F dm;
 
 	if (nmhdr->code != NM_CUSTOMDRAW)
 		return FALSE;
@@ -73,6 +75,13 @@ static BOOL onWM_NOTIFY(uiControl *c, HWND hwnd, NMHDR *nmhdr, LRESULT *lResult)
 	rt = makeHDCRenderTarget(nm->hdc, &client);
 	rt->BeginDraw();
 
+	// scale Direct2D's rendering to be in pixels instead of DIPs
+	rt->GetDpi(&dpi_x, &dpi_y);
+	ZeroMemory(&dm, sizeof (D2D1_MATRIX_3X2_F));
+	dm._11 = 96.f/dpi_x;
+	dm._22 = 96.f/dpi_y;
+	rt->SetTransform(&dm);
+
 	uiWindowsGetSizing(b->hwnd, &sizing);
 	x = 3;		// should be enough
 	y = 3;
diff --git a/windows/init.cpp b/windows/init.cpp
index c91929f9..60834629 100644
--- a/windows/init.cpp
+++ b/windows/init.cpp
@@ -70,7 +70,7 @@ const char *uiInit(uiInitOptions *o)
 	if ((si.dwFlags & STARTF_USESHOWWINDOW) != 0)
 		nCmdShow = si.wShowWindow;
 
-	// LONGTERM set DPI awareness
+	SetProcessDPIAware();
 
 	hDefaultIcon = LoadIconW(NULL, IDI_APPLICATION);
 	if (hDefaultIcon == NULL)