1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/font_fallback.h"
#include <dlfcn.h>
#import <Foundation/Foundation.h>
#include <string>
#include <vector>
#include "base/mac/foundation_util.h"
#import "base/mac/mac_util.h"
#import "base/strings/sys_string_conversions.h"
#include "ui/gfx/font.h"
// TODO(thakis): Remove this prototype once the deployment target is 10.8+.
extern "C" CFArrayRef CTFontCopyDefaultCascadeListForLanguages(
CTFontRef font,
CFArrayRef languagePrefList);
namespace gfx {
std::vector<Font> GetFallbackFonts(const Font& font) {
// On Mac "There is a system default cascade list (which is polymorphic, based
// on the user's language setting and current font)" - CoreText Programming
// Guide.
// The CoreText APIs provide CTFontCreateForString(font, string, range), but
// it requires a text string "hint", and the returned font can't be
// represented by name for easy retrieval later.
// In 10.8, CTFontCopyDefaultCascadeListForLanguages(font, language_list)
// showed up which is a good fit GetFallbackFonts().
NSArray* languages = [[NSUserDefaults standardUserDefaults]
stringArrayForKey:@"AppleLanguages"];
CFArrayRef languages_cf = base::mac::NSToCFCast(languages);
base::ScopedCFTypeRef<CFArrayRef> cascade_list(
CTFontCopyDefaultCascadeListForLanguages(
static_cast<CTFontRef>(font.GetNativeFont()), languages_cf));
std::vector<Font> fallback_fonts;
const CFIndex fallback_count = CFArrayGetCount(cascade_list);
for (CFIndex i = 0; i < fallback_count; ++i) {
CTFontDescriptorRef descriptor =
base::mac::CFCastStrict<CTFontDescriptorRef>(
CFArrayGetValueAtIndex(cascade_list, i));
base::ScopedCFTypeRef<CTFontRef> font(
CTFontCreateWithFontDescriptor(descriptor, 0.0, nullptr));
if (font.get())
fallback_fonts.push_back(Font(static_cast<NSFont*>(font.get())));
}
if (fallback_fonts.empty())
return std::vector<Font>(1, font);
return fallback_fonts;
}
} // namespace gfx
|
