Checks the possibility of overscans from EDID extension data.

ui/base/x/x11_util.h

 // 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.
 
 #ifndef UI_BASE_X_X11_UTIL_H_
 #define UI_BASE_X_X11_UTIL_H_
 
 // This file declares utility functions for X11 (Linux only).
 //
 // These functions do not require the Xlib headers to be included (which is why
@@ skipping 258 matching lines @@
 
 // Gets some useful data from the specified output device, such like
 // manufacturer's ID, serial#, and human readable name. Returns false if it
 // fails to get those data and doesn't touch manufacturer ID/serial#/name.
 // NULL can be passed for unwanted output parameters.
 UI_EXPORT bool GetOutputDeviceData(XID output,
                                    uint16* manufacturer_id,
                                    uint32* serial_number,
                                    std::string* human_readable_name);
 
+// Returns true if the EDID for the output has the flag of overscan. Note that
+// returning false does not mean no overscan, it just means the lack of flag.
+UI_EXPORT bool HasOutputOverscanFlag(XID output);
+
+// Parses |prop| as EDID data and stores extracted data into |manufacturer_id|,
+// |serial_number|, and |human_readable_name| and returns true. This is exported
+// for x11_util_unittest.cc.
+UI_EXPORT bool ParseOutputDeviceData(const unsigned char* prop,
+                                     unsigned long nitems,
+                                     uint16* manufacturer_id,
+                                     uint32* serial_number,
+                                     std::string* human_readable_name);
+
+// Parses |prop| as EDID data and stores overscan flag to |flag|. Returns true
+// if the flag is found. This is exported for x11_util_unittest.cc.
+UI_EXPORT bool ParseOutputOverscanFlag(const unsigned char* prop,
+                                       unsigned long nitems,
+                                       bool* flag);
+
 // Gets the names of the all displays physically connected to the system.
 UI_EXPORT std::vector<std::string> GetDisplayNames(
     const std::vector<XID>& output_id);
 
 // Gets the name of outputs given by |output_id|.
 UI_EXPORT std::vector<std::string> GetOutputNames(
     const std::vector<XID>& output_id);
 
 enum WindowManagerName {
   WM_UNKNOWN,
@@ skipping 92 matching lines @@
  private:
   ::Cursor cursor_;
   Display* display_;
 
   DISALLOW_COPY_AND_ASSIGN(XScopedCursor);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_UTIL_H_