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1 // Copyright (c) 2006-2008 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 // A collection of utilities for font handling. | |
6 | |
7 #ifndef BASE_GFX_FONT_UTILS_H__ | |
8 #define BASE_GFX_FONT_UTILS_H__ | |
9 | |
10 #include <usp10.h> | |
11 #include <wchar.h> | |
12 #include <windows.h> | |
13 | |
14 #include <unicode/uscript.h> | |
15 | |
16 namespace gfx { | |
17 | |
18 // The order of family types needs to be exactly the same as | |
19 // WebCore::FontDescription::GenericFamilyType. We may lift that restriction | |
20 // when we make webkit_glue::WebkitGenericToChromeGenericFamily more | |
21 // intelligent. | |
22 enum GenericFamilyType { | |
23 GENERIC_FAMILY_NONE = 0, | |
24 GENERIC_FAMILY_STANDARD, | |
25 GENERIC_FAMILY_SERIF, | |
26 GENERIC_FAMILY_SANSSERIF, | |
27 GENERIC_FAMILY_MONOSPACE, | |
28 GENERIC_FAMILY_CURSIVE, | |
29 GENERIC_FAMILY_FANTASY | |
30 }; | |
31 | |
32 // Return a font family that supports a script and belongs to |generic| font fam
ily. | |
33 // It can return NULL and a caller has to implement its own fallback. | |
34 const wchar_t* GetFontFamilyForScript(UScriptCode script, | |
35 GenericFamilyType generic); | |
36 | |
37 // Return a font family that can render |characters| based on | |
38 // what script characters belong to. When char_checked is non-NULL, | |
39 // it's filled with the character used to determine the script. | |
40 // When script_checked is non-NULL, the script used to determine | |
41 // the family is returned. | |
42 // TODO(jungshik) : This function needs a total overhaul. | |
43 const wchar_t* GetFallbackFamily(const wchar_t* characters, | |
44 int length, | |
45 GenericFamilyType generic, | |
46 UChar32 *char_checked, | |
47 UScriptCode *script_checked); | |
48 // Derive a new HFONT by replacing lfFaceName of LOGFONT with |family|, | |
49 // calculate the ascent for the derived HFONT, and initialize SCRIPT_CACHE | |
50 // in FontData. | |
51 // |style| is only used for cache key generation. |style| is | |
52 // bit-wise OR of BOLD(1), UNDERLINED(2) and ITALIC(4) and | |
53 // should match what's contained in LOGFONT. It should be calculated | |
54 // by calling GetStyleFromLogFont. | |
55 // Returns false if the font is not accessible, in which case |ascent| field | |
56 // of |fontdata| is set to kUndefinedAscent. | |
57 // Be aware that this is not thread-safe. | |
58 // TODO(jungshik): Instead of having three out params, we'd better have one | |
59 // (|*FontData|), but somehow it mysteriously messes up the layout for | |
60 // certain complex script pages (e.g. hi.wikipedia.org) and also crashes | |
61 // at the start-up if recently visited page list includes pages with complex | |
62 // scripts in their title. Moreover, somehow the very first-pass of | |
63 // intl2 page-cycler test is noticeably slower with one out param than | |
64 // the current version although the subsequent 9 passes take about the | |
65 // same time. | |
66 bool GetDerivedFontData(const wchar_t *family, | |
67 int style, | |
68 LOGFONT *logfont, | |
69 int *ascent, | |
70 HFONT *hfont, | |
71 SCRIPT_CACHE **script_cache); | |
72 | |
73 enum { | |
74 FONT_STYLE_NORMAL = 0, | |
75 FONT_STYLE_BOLD = 1, | |
76 FONT_STYLE_ITALIC = 2, | |
77 FONT_STYLE_UNDERLINED = 4 | |
78 }; | |
79 | |
80 // Derive style (bit-wise OR of FONT_STYLE_BOLD, FONT_STYLE_UNDERLINED, and | |
81 // FONT_STYLE_ITALIC) from LOGFONT. Returns 0 if |*logfont| is NULL. | |
82 int GetStyleFromLogfont(const LOGFONT *logfont); | |
83 | |
84 } // namespace gfx | |
85 | |
86 #endif // BASE_GFX_FONT_UTILS_H__ | |
87 | |
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