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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 | |
14 namespace gfx { | |
15 | |
16 class ScopedPangoFontDescription; | |
17 | |
18 // Allows a Linux platform-specific overriding of font preferences. | |
19 class 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_ | |
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