From 5f530c5bf73e833b062d40c7c6db81c68bb3fb1f Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Wed, 9 Dec 2015 15:36:56 -0500
Subject: [PATCH] More MinGW stuff.

---
 README.md      |  1 +
 windows/area.c | 13 +------------
 2 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index b96697bf..03a7e5d2 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ This README is being written.
 	* MinGW is currently unsupported. MinGW-w64 support will be re-added once the following features come in:
 		* [Isolation awareness](https://msdn.microsoft.com/en-us/library/aa375197%28v=vs.85%29.aspx)
 		* Linker symbols for some functions such as `TaskDialog()` (which I thought I submitted...)
+		* [A bug in the definition of the C macro `ID2D1RenderTarget_GetSize()`](https://sourceforge.net/p/mingw-w64/mailman/message/33176880/)
 * Unix: nothing specific
 * Mac OS X: nothing specific, so long as you can build Cocoa programs
 
diff --git a/windows/area.c b/windows/area.c
index 8889f9af..a0b9a9e4 100644
--- a/windows/area.c
+++ b/windows/area.c
@@ -24,17 +24,6 @@ uiWindowsDefineControl(
 	uiAreaType							// type function
 )
 
-// see https://sourceforge.net/p/mingw-w64/mailman/message/33176880/
-// TODO highly unsafe code
-static void rtGetSize(ID2D1RenderTarget *rt, D2D1_SIZE_F *size)
-{
-	typedef void (STDMETHODCALLTYPE *gsp)(ID2D1RenderTarget *, D2D1_SIZE_F *);
-	gsp gs;
-
-	gs = (gsp) (rt->lpVtbl->GetSize);
-	(*gs)(rt, size);
-}
-
 static HRESULT doPaint(uiArea *a, ID2D1RenderTarget *rt, RECT *clip)
 {
 	uiAreaHandler *ah = a->ah;
@@ -45,7 +34,7 @@ static HRESULT doPaint(uiArea *a, ID2D1RenderTarget *rt, RECT *clip)
 
 	dp.Context = newContext(rt);
 
-	rtGetSize(rt, &size);
+	ID2D1RenderTarget_GetSize(rt, &size);
 	dp.ClientWidth = size.width;
 	dp.ClientHeight = size.height;