Linux: server side backing stores

chrome/common/x11_util_internal.h

Index: chrome/common/x11_util_internal.h
diff --git a/chrome/common/x11_util_internal.h b/chrome/common/x11_util_internal.h
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+// Copyright (c) 2009 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_X11_UTIL_INTERNAL_H_
+#define CHROME_COMMON_X11_UTIL_INTERNAL_H_
+
+// This file declares utility functions for X11 (Linux only).
+//
+// These functions require the inclusion of the Xlib headers. Since the Xlib
+// headers pollute so much of the namespace, this should only be included
+// when needed.
+
+extern "C" {
+#include <X11/Xlib.h>
+#include <X11/extensions/XShm.h>
+#include <X11/extensions/Xrender.h>
+}
+
+namespace x11_util {
+  // These functions cache their results and must be called from the UI thread.
+  // Currently they don't support multiple screens/displays.
+
+  // Get the XRENDER format id for ARGB32 (Skia's format).
+  XRenderPictFormat* GetRenderARGB32Format(Display* dpy);
+  // Get the XRENDER format id for the default visual on the first screen. This
+  // is the format which our GTK window will have.
+  XRenderPictFormat* GetRenderVisualFormat(Display* dpy, Visual* visual);
+};
+
+#endif  // CHROME_COMMON_X11_UTIL_H_