Patch by Thatcher Ulrich <tulrich@google.com>.

Implement "iframe shim" behavior for windowed plugins.

In FF and IE on windows, iframes are implemented as native HWNDs.  
This has the side effect that iframes display on top of windowed 
plugins. This side effect has long been known as a workaround for
allowing HTML elements to appear above plugin content.

BUG=1788

Review URL: http://codereview.chromium.org/7032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@3137 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 36 insertions, 0 deletions

diff --git a/base/gfx/gdi_util.h b/base/gfx/gdi_util.h
new file mode 100644
index 0000000..cc15e92
--- /dev/null
+++ b/base/gfx/gdi_util.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_GFX_GDI_UTIL_H__
+#define BASE_GFX_GDI_UTIL_H__
+
+#include <vector>
+#include <windows.h>
+#include "base/gfx/rect.h"
+
+namespace gfx {
+
+// Creates a BITMAPINFOHEADER structure given the bitmap's size.
+void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
+
+// Creates a BITMAPINFOHEADER structure given the bitmap's size and
+// color depth in bits per pixel.
+void CreateBitmapHeaderWithColorDepth(int width, int height, int color_depth,
+                                      BITMAPINFOHEADER* hdr);
+
+// Creates a BITMAPV4HEADER structure given the bitmap's size.  You probably
+// only need to use BMP V4 if you need transparency (alpha channel). This
+// function sets the AlphaMask to 0xff000000.
+void CreateBitmapV4Header(int width, int height, BITMAPV4HEADER* hdr);
+
+// Creates a monochrome bitmap header.
+void CreateMonochromeBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
+
+// Modify the given hrgn by subtracting the given rectangles.
+void SubtractRectanglesFromRegion(HRGN hrgn,
+                                  const std::vector<gfx::Rect>& cutouts);
+
+}  // namespace gfx
+
+#endif // BASE_GFX_GDI_UTIL_H__