gdiplus: Make get_path_hrgn work with HDC-less graphics objects.

dlls/gdiplus/region.c

@@ -884,6 +884,7 @@ GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 {
     HDC new_hdc=NULL;
+    GpGraphics *new_graphics=NULL;
     GpStatus stat;
     INT save_state;
 
@@ -893,13 +894,20 @@ static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
         if (!new_hdc)
             return OutOfMemory;
 
-        stat = GdipCreateFromHDC(new_hdc, &graphics);
+        stat = GdipCreateFromHDC(new_hdc, &new_graphics);
+        graphics = new_graphics;
         if (stat != Ok)
         {
             ReleaseDC(0, new_hdc);
             return stat;
         }
     }
+    else if (!graphics->hdc)
+    {
+        graphics->hdc = new_hdc = GetDC(0);
+        if (!new_hdc)
+            return OutOfMemory;
+    }
 
     save_state = SaveDC(graphics->hdc);
     EndPath(graphics->hdc);
@@ -918,7 +926,10 @@ static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
     if (new_hdc)
     {
         ReleaseDC(0, new_hdc);
-        GdipDeleteGraphics(graphics);
+        if (new_graphics)
+            GdipDeleteGraphics(new_graphics);
+        else
+            graphics->hdc = NULL;
     }
 
     return stat;