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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/font_list_impl.h"
#include <stddef.h>
#include <algorithm>
#include "base/check_op.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "ui/gfx/font_list.h"
namespace gfx {
namespace {
// Returns a font description from |families|, |style|, and |size_pixels|.
std::string BuildDescription(const std::vector<std::string>& families,
int style,
int size_pixels,
Font::Weight weight) {
std::string description = base::JoinString(families, ",");
description += ",";
if (style & Font::ITALIC)
description += "Italic ";
switch (weight) {
case Font::Weight::THIN:
description += "Thin ";
break;
case Font::Weight::EXTRA_LIGHT:
description += "Ultra-Light ";
break;
case Font::Weight::LIGHT:
description += "Light ";
break;
case Font::Weight::MEDIUM:
description += "Medium ";
break;
case Font::Weight::SEMIBOLD:
description += "Semi-Bold ";
break;
case Font::Weight::BOLD:
description += "Bold ";
break;
case Font::Weight::EXTRA_BOLD:
description += "Ultra-Bold ";
break;
case Font::Weight::BLACK:
description += "Heavy ";
break;
case Font::Weight::NORMAL:
case Font::Weight::INVALID:
break;
}
description += base::NumberToString(size_pixels);
description += "px";
return description;
}
} // namespace
FontListImpl::FontListImpl(const std::string& font_description_string)
: font_description_string_(font_description_string),
common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1),
font_weight_(Font::Weight::INVALID) {
DCHECK(!font_description_string.empty());
// DCHECK description string ends with "px" for size in pixel.
DCHECK(font_description_string.ends_with("px"));
}
FontListImpl::FontListImpl(const std::vector<std::string>& font_names,
int font_style,
int font_size,
Font::Weight font_weight)
: font_description_string_(
BuildDescription(font_names, font_style, font_size, font_weight)),
common_height_(-1),
common_baseline_(-1),
font_style_(font_style),
font_size_(font_size),
font_weight_(font_weight) {
DCHECK(!font_names.empty());
DCHECK(!font_names[0].empty());
}
FontListImpl::FontListImpl(const std::vector<Font>& fonts)
: fonts_(fonts),
common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1),
font_weight_(Font::Weight::INVALID) {
DCHECK(!fonts.empty());
font_style_ = fonts[0].GetStyle();
font_size_ = fonts[0].GetFontSize();
font_weight_ = fonts[0].GetWeight();
#if DCHECK_IS_ON()
for (size_t i = 1; i < fonts.size(); ++i) {
DCHECK_EQ(fonts[i].GetStyle(), font_style_);
DCHECK_EQ(fonts[i].GetFontSize(), font_size_);
}
#endif
}
FontListImpl::FontListImpl(const Font& font)
: common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1),
font_weight_(Font::Weight::INVALID) {
fonts_.push_back(font);
}
FontListImpl* FontListImpl::Derive(int size_delta,
int font_style,
Font::Weight weight) const {
// If there is a font vector, derive from that.
if (!fonts_.empty()) {
std::vector<Font> fonts = fonts_;
for (size_t i = 0; i < fonts.size(); ++i)
fonts[i] = fonts[i].Derive(size_delta, font_style, weight);
return new FontListImpl(fonts);
}
// Otherwise, parse the font description string to derive from it.
std::vector<std::string> font_names;
int old_size;
int old_style;
Font::Weight old_weight;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&old_style, &old_size, &old_weight));
const int size = std::max(1, old_size + size_delta);
return new FontListImpl(font_names, font_style, size, weight);
}
int FontListImpl::GetHeight() const {
if (common_height_ == -1)
CacheCommonFontHeightAndBaseline();
return common_height_;
}
int FontListImpl::GetBaseline() const {
if (common_baseline_ == -1)
CacheCommonFontHeightAndBaseline();
return common_baseline_;
}
int FontListImpl::GetCapHeight() const {
// Assume the primary font is used to render Latin characters.
return GetPrimaryFont().GetCapHeight();
}
int FontListImpl::GetExpectedTextWidth(int length) const {
// Rely on the primary font metrics for the time being.
return GetPrimaryFont().GetExpectedTextWidth(length);
}
int FontListImpl::GetFontStyle() const {
if (font_style_ == -1)
CacheFontStyleAndSize();
return font_style_;
}
int FontListImpl::GetFontSize() const {
if (font_size_ == -1)
CacheFontStyleAndSize();
return font_size_;
}
Font::Weight FontListImpl::GetFontWeight() const {
if (font_weight_ == Font::Weight::INVALID)
CacheFontStyleAndSize();
return font_weight_;
}
const std::vector<Font>& FontListImpl::GetFonts() const {
if (fonts_.empty()) {
DCHECK(!font_description_string_.empty());
std::vector<std::string> font_names;
// It's possible that Font::UNDERLINE is specified and it's already
// stored in |font_style_| but |font_description_string_| doesn't have the
// underline info. So we should respect |font_style_| as long as it's
// valid.
int style = 0;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&style, &font_size_, &font_weight_));
if (font_style_ == -1)
font_style_ = style;
for (size_t i = 0; i < font_names.size(); ++i) {
DCHECK(!font_names[i].empty());
Font font(font_names[i], font_size_);
if (font_style_ == Font::NORMAL && font_weight_ == Font::Weight::NORMAL)
fonts_.push_back(font);
else
fonts_.push_back(font.Derive(0, font_style_, font_weight_));
}
}
return fonts_;
}
const Font& FontListImpl::GetPrimaryFont() const {
return GetFonts()[0];
}
FontListImpl::~FontListImpl() {}
void FontListImpl::CacheCommonFontHeightAndBaseline() const {
int ascent = 0;
int descent = 0;
const std::vector<Font>& fonts = GetFonts();
for (auto i = fonts.begin(); i != fonts.end(); ++i) {
ascent = std::max(ascent, i->GetBaseline());
descent = std::max(descent, i->GetHeight() - i->GetBaseline());
}
common_height_ = ascent + descent;
common_baseline_ = ascent;
}
void FontListImpl::CacheFontStyleAndSize() const {
if (!fonts_.empty()) {
font_style_ = fonts_[0].GetStyle();
font_size_ = fonts_[0].GetFontSize();
font_weight_ = fonts_[0].GetWeight();
} else {
std::vector<std::string> font_names;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&font_style_, &font_size_, &font_weight_));
}
}
} // namespace gfx
|
