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

6 files changed, 29 insertions, 9 deletions

diff --git a/base/gfx/bitmap_platform_device_win.cc b/base/gfx/bitmap_platform_device_win.cc
index 1209db1..2031027 100644
--- a/base/gfx/bitmap_platform_device_win.cc
+++ b/base/gfx/bitmap_platform_device_win.cc
@@ -4,7 +4,7 @@
 
 #include "base/gfx/bitmap_platform_device_win.h"
 
-#include "base/gfx/bitmap_header.h"
+#include "base/gfx/gdi_util.h"
 #include "base/logging.h"
 #include "base/process_util.h"
 #include "SkMatrix.h"
diff --git a/base/gfx/bitmap_header.cc b/base/gfx/gdi_util.cc
index acaf0c0..48df853 100644
--- a/base/gfx/bitmap_header.cc
+++ b/base/gfx/gdi_util.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/gfx/bitmap_header.h"
+#include "base/gfx/gdi_util.h"
 
 namespace gfx {
 
@@ -60,5 +60,21 @@ void CreateMonochromeBitmapHeader(int width,
   hdr->biClrImportant = 0;
 }
 
+void SubtractRectanglesFromRegion(HRGN hrgn,
+                                  const std::vector<gfx::Rect>& cutouts) {
+  if (cutouts.size()) {
+    HRGN cutout = ::CreateRectRgn(0, 0, 0, 0);
+    for (size_t i = 0; i < cutouts.size(); i++) {
+      ::SetRectRgn(cutout,
+                   cutouts[i].x(),
+                   cutouts[i].y(),
+                   cutouts[i].right(),
+                   cutouts[i].bottom());
+      ::CombineRgn(hrgn, hrgn, cutout, RGN_DIFF);
+    }
+    ::DeleteObject(cutout);
+  }
+}
+
 }  // namespace gfx
 
diff --git a/base/gfx/bitmap_header.h b/base/gfx/gdi_util.h
index 0c8066b..cc15e92 100644
--- a/base/gfx/bitmap_header.h
+++ b/base/gfx/gdi_util.h
@@ -2,10 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BASE_GFX_BITMAP_HEADER_H__
-#define BASE_GFX_BITMAP_HEADER_H__
+#ifndef BASE_GFX_GDI_UTIL_H__
+#define BASE_GFX_GDI_UTIL_H__
 
+#include <vector>
 #include <windows.h>
+#include "base/gfx/rect.h"
 
 namespace gfx {
 
@@ -25,8 +27,10 @@ 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_BITMAP_HEADER_H__
-
+#endif // BASE_GFX_GDI_UTIL_H__
diff --git a/base/gfx/native_theme.cc b/base/gfx/native_theme.cc
index ea55502..b8aa30c 100644
--- a/base/gfx/native_theme.cc
+++ b/base/gfx/native_theme.cc
@@ -9,7 +9,7 @@
 #include <vsstyle.h>
 #include <vssym32.h>
 
-#include "base/gfx/bitmap_header.h"
+#include "base/gfx/gdi_util.h"
 #include "base/gfx/platform_canvas_win.h"
 #include "base/gfx/skia_utils.h"
 #include "base/gfx/rect.h"
diff --git a/base/gfx/vector_canvas_unittest.cc b/base/gfx/vector_canvas_unittest.cc
index 65d3d5f..60a79ba 100644
--- a/base/gfx/vector_canvas_unittest.cc
+++ b/base/gfx/vector_canvas_unittest.cc
@@ -8,7 +8,7 @@
 
 #include "base/command_line.h"
 #include "base/file_util.h"
-#include "base/gfx/bitmap_header.h"
+#include "base/gfx/gdi_util.h"
 #include "base/gfx/png_decoder.h"
 #include "base/gfx/png_encoder.h"
 #include "base/gfx/size.h"
diff --git a/base/gfx/vector_device.cc b/base/gfx/vector_device.cc
index 8778299..7230e2b 100644
--- a/base/gfx/vector_device.cc
+++ b/base/gfx/vector_device.cc
@@ -4,7 +4,7 @@
 
 #include "base/gfx/vector_device.h"
 
-#include "base/gfx/bitmap_header.h"
+#include "base/gfx/gdi_util.h"
 #include "base/gfx/skia_utils.h"
 #include "base/logging.h"
 #include "base/scoped_handle.h"