Unify desktop Linux and Chrome OS font rendering params.

ui/gfx/linux_font_delegate.h

 // Copyright 2013 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_GFX_LINUX_FONT_DELEGATE_H_
 #define UI_GFX_LINUX_FONT_DELEGATE_H_
 
 #include <string>
 
+#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/font_render_params.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
-// Allows a Linux platform specific overriding of font preferences.
+class ScopedPangoFontDescription;
+
+// Allows a Linux platform-specific overriding of font preferences.
 class GFX_EXPORT LinuxFontDelegate {
  public:
   virtual ~LinuxFontDelegate() {}
 
   // Sets the dynamically loaded singleton that provides font preferences.
   // This pointer is not owned, and if this method is called a second time,
   // the first instance is not deleted.
   static void SetInstance(LinuxFontDelegate* instance);
 
   // Returns a LinuxFontDelegate instance for the toolkit used in
   // the user's desktop environment.
   //
   // Can return NULL, in case no toolkit has been set. (For example, if we're
   // running with the "--ash" flag.)
   static const LinuxFontDelegate* instance();
 
-  // Whether we should antialias our text.
-  virtual bool UseAntialiasing() const = 0;
+  // Returns the default font rendering settings.
+  virtual FontRenderParams GetDefaultFontRenderParams() const = 0;
 
-  // What sort of text hinting should we apply?
-  virtual FontRenderParams::Hinting GetHintingStyle() const = 0;
-
-  // What sort of subpixel rendering should we perform.
-  virtual FontRenderParams::SubpixelRendering
-      GetSubpixelRenderingStyle() const = 0;
-
-  // Returns the Pango description for the default UI font. The format matches
-  // that returned by pango_font_description_to_string().
-  virtual std::string GetDefaultFontDescription() const = 0;
+  // Returns the Pango description for the default UI font.
+  virtual scoped_ptr<ScopedPangoFontDescription>
+      GetDefaultPangoFontDescription() const = 0;
 
   // Returns the resolution (as pixels-per-inch) that should be used to convert
   // font sizes between points and pixels. -1 is returned if the DPI is unset.
   virtual double GetFontDPI() const = 0;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_LINUX_FONT_DELEGATE_H_