From: Mark Harmstone <hellas@burntcomma.com>
Subject: [PATCH 1/5] include: Add Wine-specific theming hook struct to winuser.h
Message-Id: <55109FA9.2070800@burntcomma.com>
Date: Mon, 23 Mar 2015 23:20:09 +0000

These patches add theming hook support to uxtheme and user32. On Windows, user32
calls ThemeInitApiHook in uxtheme when a program is launched, and via an
undocumented interface exchanges the addresses of various functions. This is
needed because uxtheme is used to draw the non-client parts of windows - the
captions, the scrollbars, etc.

Because we're using our own interface here, as the official one is undocumented,
I've renamed the hook function WINE_ThemeInitApiHook, to avoid any problems if
anyone ever gets native uxtheme running.

---
 include/winuser.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/winuser.h b/include/winuser.h
index 3d9b937..1f19863 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -4060,6 +4060,15 @@ WORD        WINAPI SYSTEM_KillSystemTimer( WORD );
 WINUSERAPI BOOL CDECL __wine_send_input( HWND hwnd, const INPUT *input );
 #endif
 
+/* Wine-specific version of the undocumented structs
+ * used by uxtheme to hook into user32. */
+
+typedef struct
+{
+  WNDPROC DefWindowProcA;
+  WNDPROC DefWindowProcW;
+} WINEUSERAPIHOOK;
+
 #ifdef __cplusplus
 }
 #endif