Windows: Fix rendering of background color and resize corner (issue #1161).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1547@1551 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_host_impl_win.cc

@@ -505,7 +505,7 @@ LRESULT CALLBACK CefBrowserHostImpl::WndProc(HWND hwnd, UINT message,
     return 0;
 
   case WM_ERASEBKGND:
-    return 0;
+    return 1;
 
   case WM_DWMCOMPOSITIONCHANGED:
     // Message sent to top-level windows when composition has been enabled or

patch/patch.cfg

@@ -86,6 +86,12 @@ patches = [
     'name': 'screen_mac',
     'path': '../ui/gfx/',
   },
+  {
+    # Fix rendering of background color and resize corner on Windows.
+    # http://code.google.com/p/chromiumembedded/issues/detail?id=1161
+    'name': 'web_contents_1161',
+    'path': '../content/browser/web_contents/',
+  },
   {
     # http://code.google.com/p/chromiumembedded/issues/detail?id=364
     'name': 'spi_webcore_364',

patch/patches/web_contents_1161.patch

@@ -0,0 +1,42 @@
+Index: web_contents_view_win.cc
+===================================================================
+--- web_contents_view_win.cc	(revision 226504)
++++ web_contents_view_win.cc	(working copy)
+@@ -299,6 +299,15 @@
+   rvh->GetDelegate()->Close(rvh);
+ }
+ 
++void WebContentsViewWin::OnNCPaint(HRGN update_region) {
++  // Do nothing.  This suppresses the resize corner that Windows would
++  // otherwise draw for us.
++}
++
++LRESULT WebContentsViewWin::OnEraseBkgnd(HDC dc) {
++  return 1;
++}
++
+ LRESULT WebContentsViewWin::OnCreate(
+     UINT message, WPARAM wparam, LPARAM lparam, BOOL& handled) {
+   hwnd_to_wcv_map.insert(std::make_pair(hwnd(), this));
+Index: web_contents_view_win.h
+===================================================================
+--- web_contents_view_win.h	(revision 226504)
++++ web_contents_view_win.h	(working copy)
+@@ -36,6 +36,8 @@
+   virtual ~WebContentsViewWin();
+ 
+   BEGIN_MSG_MAP_EX(WebContentsViewWin)
++    MSG_WM_NCPAINT(OnNCPaint)
++    MSG_WM_ERASEBKGND(OnEraseBkgnd)
+     MESSAGE_HANDLER(WM_CREATE, OnCreate)
+     MESSAGE_HANDLER(WM_DESTROY, OnDestroy)
+     MESSAGE_HANDLER(WM_WINDOWPOSCHANGED, OnWindowPosChanged)
+@@ -102,6 +104,8 @@
+   void EndDragging();
+   void CloseTab();
+ 
++  void OnNCPaint(HRGN update_region);
++  LRESULT OnEraseBkgnd(HDC dc);
+   LRESULT OnCreate(
+       UINT message, WPARAM wparam, LPARAM lparam, BOOL& handled);
+   LRESULT OnDestroy(

tests/cefclient/cefclient_win.cpp

@@ -563,7 +563,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam,
         if (hwnd) {
           // Dont erase the background if the browser window has been loaded
           // (this avoids flashing)
-          return 0;
+          return 1;
         }
       }
       break;