Don't use DirectWrite if smoothing or ClearType is off

content/common/sandbox_win.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.
 
 #include "content/common/sandbox_win.h"
 
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 572 matching lines @@
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kDisableDirectWrite))
     return false;
 
 #if !defined(NACL_WIN64)
   // Can't use GDI on HiDPI.
   if (gfx::GetDPIScale() > 1.0f)
     return true;
 #endif
 
+  // If anti-aliasing or ClearType are off, don't use DirectWrite.
+  BOOL smoothing = FALSE;
+  SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &smoothing, 0);
+  if (!smoothing)
+    return false;
+  UINT smooth_type = 0;
+  SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &smooth_type, 0);
+  if (smooth_type != FE_FONTSMOOTHINGCLEARTYPE)
+    return false;
+
   // Otherwise, check the field trial.
   const std::string group_name =
       base::FieldTrialList::FindFullName("DirectWrite");
   return group_name != "Disabled";
 }
 
 base::ProcessHandle StartSandboxedProcess(
     SandboxedProcessLauncherDelegate* delegate,
     CommandLine* cmd_line) {
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
@@ skipping 171 matching lines @@
   }
 
   return false;
 }
 
 bool BrokerAddTargetPeer(HANDLE peer_process) {
   return g_broker_services->AddTargetPeer(peer_process) == sandbox::SBOX_ALL_OK;
 }
 
 }  // namespace content