POSIX: bitmap data on the wire

chrome/common/bitmap_wire_data.h

+// 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 CHROME_COMMON_BITMAP_WIRE_DATA_H_
+#define CHROME_COMMON_BITMAP_WIRE_DATA_H_
+
+#if defined(OS_POSIX)
+class SkBitmap;
+#endif
+
+// BitmapWireData is the type of the bitmap data which is carried from renderer
+// to browser over the wire.
+
+#if defined(OS_WIN)
+
+// On Windows, the bitmap data is carried out-of-band in a shared memory
+// segment. This is the handle to the shared memory. These handles are valid
+// only in the context of the renderer process.
+// TODO(agl): get a clarification on that last sentence. It doesn't make any
+// sense to me
+typedef HANDLE BitmapWireData;
+
+#elif defined(OS_POSIX)
+
+// On POSIX, we currently serialise the bitmap data over the wire. This will
+// change at some point when we too start using shared memory, but we wish to
+// use shared memory in a different way so this is a temporary work-around.
+// TODO(port): implement drawing with shared backing stores and replace this
+//   with an IPC no-op type.
+typedef SkBitmap BitmapWireData;
+
+#endif  // defined(OS_WIN)
+
+#endif  // CHROME_COMMON_BITMAP_WIRE_DATA_H_