user32: Implement PrintWindow.

dlls/user32/painting.c

@@ -1549,3 +1549,18 @@ BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
 {
     return USER_Driver->pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
 }
+
+/************************************************************************
+ *		PrintWindow (USER32.@)
+ *
+ */
+BOOL WINAPI PrintWindow(HWND hwnd, HDC hdcBlt, UINT nFlags)
+{
+    UINT flags = PRF_CHILDREN | PRF_ERASEBKGND | PRF_OWNED | PRF_CLIENT;
+    if(!(nFlags & PW_CLIENTONLY))
+    {
+        flags |= PRF_NONCLIENT;
+    }
+    SendMessageW(hwnd, WM_PRINT, (WPARAM)hdcBlt, flags);
+    return TRUE;
+}

dlls/user32/user32.spec

@@ -533,7 +533,7 @@
 @ stdcall PostQuitMessage(long)
 @ stdcall PostThreadMessageA(long long long long)
 @ stdcall PostThreadMessageW(long long long long)
-# @ stub PrintWindow
+@ stdcall PrintWindow(long long long)
 @ stdcall PrivateExtractIconExA(str long ptr ptr long)
 @ stdcall PrivateExtractIconExW(wstr long ptr ptr long)
 @ stdcall PrivateExtractIconsA (str long long long ptr ptr long long)

include/winuser.h

@@ -1493,6 +1493,9 @@ WINUSERAPI BOOL     WINAPI SetSysColors(INT,const INT*,const COLORREF*);
 #define ENUM_CURRENT_SETTINGS  ((DWORD) -1)
 #define ENUM_REGISTRY_SETTINGS ((DWORD) -2)
 
+/* Used for PrintWindow */
+#define PW_CLIENTONLY   0x00000001
+
 /****** Window classes ******/
 
 typedef struct tagCREATESTRUCTA