gdi32: Implement MirrorRgn.

dlls/gdi32/gdi32.spec

@@ -363,7 +363,7 @@
 @ stub LoadImageColorMatcherA
 @ stub LoadImageColorMatcherW
 @ stdcall MaskBlt(long long long long long long long long long long long long)
-# @ stub MirrorRgn
+@ stdcall MirrorRgn(long long)
 @ stdcall ModifyWorldTransform(long ptr long)
 @ stdcall MoveToEx(long long long ptr)
 @ stdcall NamedEscape(long wstr long long ptr long ptr)

dlls/gdi32/region.c

@@ -1516,6 +1516,27 @@ INT mirror_region( HRGN dst, HRGN src, INT width )
 }
 
 /***********************************************************************
+ *           MirrorRgn    (GDI32.@)
+ */
+BOOL WINAPI MirrorRgn( HWND hwnd, HRGN hrgn )
+{
+    static const WCHAR user32W[] = {'u','s','e','r','3','2','.','d','l','l',0};
+    static BOOL (WINAPI *pGetWindowRect)( HWND hwnd, LPRECT rect );
+    RECT rect;
+
+    /* yes, a HWND in gdi32, don't ask */
+    if (!pGetWindowRect)
+    {
+        HMODULE user32 = GetModuleHandleW(user32W);
+        if (!user32) return FALSE;
+        if (!(pGetWindowRect = (void *)GetProcAddress( user32, "GetWindowRect" ))) return FALSE;
+    }
+    pGetWindowRect( hwnd, &rect );
+    return mirror_region( hrgn, hrgn, rect.right - rect.left ) != ERROR;
+}
+
+
+/***********************************************************************
  *           REGION_Coalesce
  *
  *      Attempt to merge the rects in the current band with those in the

dlls/user32/tests/win.c

@@ -58,6 +58,7 @@ static BOOL (WINAPI *pGetProcessDefaultLayout)( DWORD *layout );
 static BOOL (WINAPI *pSetProcessDefaultLayout)( DWORD layout );
 static DWORD (WINAPI *pSetLayout)(HDC hdc, DWORD layout);
 static DWORD (WINAPI *pGetLayout)(HDC hdc);
+static BOOL (WINAPI *pMirrorRgn)(HWND hwnd, HRGN hrgn);
 
 static BOOL test_lbuttondown_flag;
 static HWND hwndMessage;
@@ -6126,7 +6127,7 @@ static void test_winregion(void)
 {
     HWND hwnd;
     RECT r;
-    int ret;
+    int ret, width;
     HRGN hrgn;
 
     if (!pGetWindowRgnBox)
@@ -6159,7 +6160,21 @@ static void test_winregion(void)
         ok( r.left == 2 && r.top == 3 && r.right == 10 && r.bottom == 15,
            "Expected (2,3,10,15), got (%d,%d,%d,%d)\n", r.left, r.top,
                                                             r.right, r.bottom);
-        DeleteObject(hrgn);
+        if (pMirrorRgn)
+        {
+            hrgn = CreateRectRgn(2, 3, 10, 15);
+            ret = pMirrorRgn( hwnd, hrgn );
+            ok( ret == TRUE, "MirrorRgn failed %u\n", ret );
+            r.left = r.top = r.right = r.bottom = 0;
+            GetWindowRect( hwnd, &r );
+            width = r.right - r.left;
+            r.left = r.top = r.right = r.bottom = 0;
+            ret = GetRgnBox( hrgn, &r );
+            ok( ret == SIMPLEREGION, "GetRgnBox failed %u\n", ret );
+            ok( r.left == width - 10 && r.top == 3 && r.right == width - 2 && r.bottom == 15,
+                "Wrong rectangle (%d,%d,%d,%d) for width %d\n", r.left, r.top, r.right, r.bottom, width );
+        }
+        else win_skip( "MirrorRgn not supported\n" );
     }
     DestroyWindow(hwnd);
 }
@@ -6220,6 +6235,7 @@ START_TEST(win)
     pSetProcessDefaultLayout = (void *)GetProcAddress( user32, "SetProcessDefaultLayout" );
     pGetLayout = (void *)GetProcAddress( gdi32, "GetLayout" );
     pSetLayout = (void *)GetProcAddress( gdi32, "SetLayout" );
+    pMirrorRgn = (void *)GetProcAddress( gdi32, "MirrorRgn" );
 
     if (!RegisterWindowClasses()) assert(0);
 

include/wingdi.h

@@ -3601,6 +3601,7 @@ WINGDIAPI BOOL        WINAPI LineDDA(INT,INT,INT,INT,LINEDDAPROC,LPARAM);
 WINGDIAPI BOOL        WINAPI LineTo(HDC,INT,INT);
 WINGDIAPI BOOL        WINAPI LPtoDP(HDC,LPPOINT,INT);
 WINGDIAPI BOOL        WINAPI MaskBlt(HDC,INT,INT,INT,INT,HDC,INT,INT,HBITMAP,INT,INT,DWORD);
+WINGDIAPI BOOL        WINAPI MirrorRgn(HWND,HRGN);
 WINGDIAPI BOOL        WINAPI ModifyWorldTransform(HDC,const XFORM *, DWORD);
 WINGDIAPI BOOL        WINAPI MoveToEx(HDC,INT,INT,LPPOINT);
 WINGDIAPI INT         WINAPI OffsetClipRgn(HDC,INT,INT);