Support 8bpp screens in X11

ui/base/x/x11_util.cc

 // Copyright (c) 2012 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.
 
 // This file defines utility functions for X11 (Linux only). This code has been
 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
 // remains woefully incomplete.
 
 #include "ui/base/x/x11_util.h"
 
@@ skipping 282 matching lines @@
 
   if (shared_memory_support_cached)
     return shared_memory_support;
 
   shared_memory_support = DoQuerySharedMemorySupport(dpy);
   shared_memory_support_cached = true;
 
   return shared_memory_support;
 }
 
+bool QueryRenderSupport(Display* dpy) {
+  static bool render_supported = false;
+  static bool render_supported_cached = false;
+
+  if (render_supported_cached)
+    return render_supported;
+
+  // We don't care about the version of Xrender since all the features which
+  // we use are included in every version.
+  int dummy;
+  render_supported = XRenderQueryExtension(dpy, &dummy, &dummy);

[sadrul, 2014/05/02 01:35:45]

I think you can use a single static bool. See IsShapeAvailable() above.

+  render_supported_cached = true;
+
+  return render_supported;
+}
+
 ::Cursor GetXCursor(int cursor_shape) {
   if (!cursor_cache)
     cursor_cache = new XCursorCache;
   return cursor_cache->GetCursor(cursor_shape);
 }
 
 void ResetXCursorCache() {
   delete cursor_cache;
   cursor_cache = NULL;
 }
@@ skipping 1035 matching lines @@
       << "request_code " << static_cast<int>(error_event.request_code) << ", "
       << "minor_code " << static_cast<int>(error_event.minor_code)
       << " (" << request_str << ")";
 }
 
 // ----------------------------------------------------------------------------
 // End of x11_util_internal.h
 
 
 }  // namespace ui