ui/gfx/linux_font_delegate.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_LINUX_FONT_DELEGATE_H_
   6 #define UI_GFX_LINUX_FONT_DELEGATE_H_
   7
   8 #include <string>
   9
  10 #include "ui/gfx/font_render_params_linux.h"
  11 #include "ui/gfx/gfx_export.h"
  12
  13 namespace gfx {
  14
  15 // Allows a Linux platform specific overriding of font preferences.
  16 class GFX_EXPORT LinuxFontDelegate {
  17  public:
  18   virtual ~LinuxFontDelegate() {}
  19
  20   // Sets the dynamically loaded singleton that provides font preferences.
  21   // This pointer is not owned, and if this method is called a second time,
  22   // the first instance is not deleted.
  23   static void SetInstance(LinuxFontDelegate* instance);
  24
  25   // Returns a LinuxFontDelegate instance for the toolkit used in
  26   // the user's desktop environment.
  27   //
  28   // Can return NULL, in case no toolkit has been set. (For example, if we're
  29   // running with the "--ash" flag.)
  30   static const LinuxFontDelegate* instance();
  31
  32   // Whether we should antialias our text.
  33   virtual bool UseAntialiasing() const = 0;
  34
  35   // What sort of text hinting should we apply?
  36   virtual FontRenderParams::Hinting GetHintingStyle() const = 0;
  37
  38   // What sort of subpixel rendering should we perform.
  39   virtual FontRenderParams::SubpixelRendering
  40       GetSubpixelRenderingStyle() const = 0;
  41
  42   // Returns the default font name for pango style rendering. The format is a
  43   // string of the form "[font name] [font size]".
  44   virtual std::string GetDefaultFontName() const = 0;
  45 };
  46
  47 }  // namespace gfx
  48
  49 #endif  // UI_GFX_LINUX_FONT_DELEGATE_H_