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 "base/memory/scoped_ptr.h"
11#include "ui/gfx/font_render_params.h"
12#include "ui/gfx/gfx_export.h"
13
14namespace gfx {
15
16class ScopedPangoFontDescription;
17
18// Allows a Linux platform-specific overriding of font preferences.
19class GFX_EXPORT LinuxFontDelegate {
20 public:
21  virtual ~LinuxFontDelegate() {}
22
23  // Sets the dynamically loaded singleton that provides font preferences.
24  // This pointer is not owned, and if this method is called a second time,
25  // the first instance is not deleted.
26  static void SetInstance(LinuxFontDelegate* instance);
27
28  // Returns a LinuxFontDelegate instance for the toolkit used in
29  // the user's desktop environment.
30  //
31  // Can return NULL, in case no toolkit has been set. (For example, if we're
32  // running with the "--ash" flag.)
33  static const LinuxFontDelegate* instance();
34
35  // Returns the default font rendering settings.
36  virtual FontRenderParams GetDefaultFontRenderParams() const = 0;
37
38  // Returns the Pango description for the default UI font.
39  virtual scoped_ptr<ScopedPangoFontDescription>
40      GetDefaultPangoFontDescription() const = 0;
41
42  // Returns the resolution (as pixels-per-inch) that should be used to convert
43  // font sizes between points and pixels. -1 is returned if the DPI is unset.
44  virtual double GetFontDPI() const = 0;
45};
46
47}  // namespace gfx
48
49#endif  // UI_GFX_LINUX_FONT_DELEGATE_H_
50