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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef GFX_PLATFORM_FONT_GTK_ | 5 #ifndef GFX_PLATFORM_FONT_GTK_ |
6 #define GFX_PLATFORM_FONT_GTK_ | 6 #define GFX_PLATFORM_FONT_GTK_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/scoped_ptr.h" | 9 #include "ui/gfx/platform_font_gtk.h" |
10 #include "gfx/platform_font.h" | 10 // TODO(sail): remove this file once all includes have been updated. |
11 #include "third_party/skia/include/core/SkRefCnt.h" | |
12 | |
13 class SkTypeface; | |
14 class SkPaint; | |
15 | |
16 namespace gfx { | |
17 | |
18 class PlatformFontGtk : public PlatformFont { | |
19 public: | |
20 PlatformFontGtk(); | |
21 explicit PlatformFontGtk(const Font& other); | |
22 explicit PlatformFontGtk(NativeFont native_font); | |
23 PlatformFontGtk(const string16& font_name, | |
24 int font_size); | |
25 | |
26 // Converts |gfx_font| to a new pango font. Free the returned font with | |
27 // pango_font_description_free(). | |
28 static PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font); | |
29 | |
30 // Position as an offset from the height of the drawn text, used to draw | |
31 // an underline. This is a negative number, so the underline would be | |
32 // drawn at y + height + underline_position; | |
33 double underline_position() const; | |
34 // The thickness to draw the underline. | |
35 double underline_thickness() const; | |
36 | |
37 // Overridden from PlatformFont: | |
38 virtual Font DeriveFont(int size_delta, int style) const; | |
39 virtual int GetHeight() const; | |
40 virtual int GetBaseline() const; | |
41 virtual int GetAverageCharacterWidth() const; | |
42 virtual int GetStringWidth(const string16& text) const; | |
43 virtual int GetExpectedTextWidth(int length) const; | |
44 virtual int GetStyle() const; | |
45 virtual string16 GetFontName() const; | |
46 virtual int GetFontSize() const; | |
47 virtual NativeFont GetNativeFont() const; | |
48 | |
49 private: | |
50 // Create a new instance of this object with the specified properties. Called | |
51 // from DeriveFont. | |
52 PlatformFontGtk(SkTypeface* typeface, | |
53 const string16& name, | |
54 int size, | |
55 int style); | |
56 virtual ~PlatformFontGtk(); | |
57 | |
58 // Initialize this object. | |
59 void InitWithNameAndSize(const string16& font_name, int font_size); | |
60 void InitWithTypefaceNameSizeAndStyle(SkTypeface* typeface, | |
61 const string16& name, | |
62 int size, | |
63 int style); | |
64 void InitFromPlatformFont(const PlatformFontGtk* other); | |
65 | |
66 // Potentially slow call to get pango metrics (average width, underline info). | |
67 void InitPangoMetrics(); | |
68 | |
69 // Setup a Skia context to use the current typeface | |
70 void PaintSetup(SkPaint* paint) const; | |
71 | |
72 // Make |this| a copy of |other|. | |
73 void CopyFont(const Font& other); | |
74 | |
75 // The average width of a character, initialized and cached if needed. | |
76 double GetAverageWidth() const; | |
77 | |
78 // These two both point to the same SkTypeface. We use the SkAutoUnref to | |
79 // handle the reference counting, but without @typeface_ we would have to | |
80 // cast the SkRefCnt from @typeface_helper_ every time. | |
81 scoped_ptr<SkAutoUnref> typeface_helper_; | |
82 SkTypeface *typeface_; | |
83 | |
84 // Additional information about the face | |
85 // Skia actually expects a family name and not a font name. | |
86 string16 font_family_; | |
87 int font_size_pixels_; | |
88 int style_; | |
89 | |
90 // Cached metrics, generated at construction | |
91 int height_pixels_; | |
92 int ascent_pixels_; | |
93 | |
94 // The pango metrics are much more expensive so we wait until we need them | |
95 // to compute them. | |
96 bool pango_metrics_inited_; | |
97 double average_width_pixels_; | |
98 double underline_position_pixels_; | |
99 double underline_thickness_pixels_; | |
100 | |
101 // The default font, used for the default constructor. | |
102 static Font* default_font_; | |
103 }; | |
104 | |
105 } // namespace gfx | |
106 | 11 |
107 #endif // GFX_PLATFORM_FONT_GTK_ | 12 #endif // GFX_PLATFORM_FONT_GTK_ |
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