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
|
/*
* Copyright (C) 2007 Apple Computer, Inc.
* Copyright (c) 2007, 2008, 2009, Google Inc. All rights reserved.
* Copyright (C) 2010 Company 100, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/fonts/font_custom_platform_data.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_platform_data.h"
#include "third_party/blink/renderer/platform/fonts/opentype/font_format_check.h"
#include "third_party/blink/renderer/platform/fonts/opentype/font_settings.h"
#include "third_party/blink/renderer/platform/fonts/web_font_decoder.h"
#include "third_party/blink/renderer/platform/fonts/web_font_typeface_factory.h"
#include "third_party/blink/renderer/platform/shared_buffer.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkTypeface.h"
namespace blink {
namespace {
sk_sp<SkFontMgr> FontManagerForSubType(
FontFormatCheck::VariableFontSubType font_sub_type) {
CHECK_NE(font_sub_type, FontFormatCheck::VariableFontSubType::kNotVariable);
if (font_sub_type == FontFormatCheck::VariableFontSubType::kVariableCFF2)
return WebFontTypefaceFactory::FreeTypeFontManager();
return WebFontTypefaceFactory::FontManagerForVariations();
}
} // namespace
FontCustomPlatformData::FontCustomPlatformData(sk_sp<SkTypeface> typeface,
size_t data_size)
: base_typeface_(std::move(typeface)), data_size_(data_size) {}
FontCustomPlatformData::~FontCustomPlatformData() = default;
FontPlatformData FontCustomPlatformData::GetFontPlatformData(
float size,
bool bold,
bool italic,
const FontSelectionRequest& selection_request,
const FontSelectionCapabilities& selection_capabilities,
FontOrientation orientation,
const FontVariationSettings* variation_settings) {
DCHECK(base_typeface_);
sk_sp<SkTypeface> return_typeface = base_typeface_;
// Maximum axis count is maximum value for the OpenType USHORT,
// which is a 16bit unsigned.
// https://www.microsoft.com/typography/otspec/fvar.htm Variation
// settings coming from CSS can have duplicate assignments and the
// list can be longer than UINT16_MAX, but ignoring the length for
// now, going with a reasonable upper limit. Deduplication is
// handled by Skia with priority given to the last occuring
// assignment.
FontFormatCheck::VariableFontSubType font_sub_type =
FontFormatCheck::ProbeVariableFont(base_typeface_);
if (font_sub_type ==
FontFormatCheck::VariableFontSubType::kVariableTrueType ||
font_sub_type == FontFormatCheck::VariableFontSubType::kVariableCFF2) {
Vector<SkFontArguments::Axis, 0> axes;
SkFontArguments::Axis weight_axis = {
SkSetFourByteTag('w', 'g', 'h', 't'),
SkFloatToScalar(selection_capabilities.weight.clampToRange(
selection_request.weight))};
SkFontArguments::Axis width_axis = {
SkSetFourByteTag('w', 'd', 't', 'h'),
SkFloatToScalar(selection_capabilities.width.clampToRange(
selection_request.width))};
SkFontArguments::Axis slant_axis = {
SkSetFourByteTag('s', 'l', 'n', 't'),
SkFloatToScalar(selection_capabilities.slope.clampToRange(
selection_request.slope))};
axes.push_back(weight_axis);
axes.push_back(width_axis);
axes.push_back(slant_axis);
if (variation_settings && variation_settings->size() < UINT16_MAX) {
axes.ReserveCapacity(variation_settings->size() + axes.size());
for (const auto& setting : *variation_settings) {
SkFontArguments::Axis axis = {AtomicStringToFourByteTag(setting.Tag()),
SkFloatToScalar(setting.Value())};
axes.push_back(axis);
}
}
int index;
std::unique_ptr<SkStreamAsset> stream(base_typeface_->openStream(&index));
sk_sp<SkTypeface> sk_variation_font(FontManagerForSubType(font_sub_type)
->makeFromStream(std::move(stream),
SkFontArguments().setCollectionIndex(index)
.setAxes(axes.data(), axes.size())));
if (sk_variation_font) {
return_typeface = sk_variation_font;
} else {
SkString family_name;
base_typeface_->getFamilyName(&family_name);
// TODO: Surface this as a console message?
LOG(ERROR) << "Unable for apply variation axis properties for font: "
<< family_name.c_str();
}
}
return FontPlatformData(std::move(return_typeface), std::string(), size,
bold && !base_typeface_->isBold(),
italic && !base_typeface_->isItalic(), orientation);
}
SkString FontCustomPlatformData::FamilyNameForInspector() const {
SkTypeface::LocalizedStrings* font_family_iterator =
base_typeface_->createFamilyNameIterator();
SkTypeface::LocalizedString localized_string;
while (font_family_iterator->next(&localized_string)) {
// BCP 47 tags for English take precedent in font matching over other
// localizations: https://drafts.csswg.org/css-fonts/#descdef-src.
if (localized_string.fLanguage.equals("en") ||
localized_string.fLanguage.equals("en-US")) {
break;
}
}
font_family_iterator->unref();
return localized_string.fString;
}
scoped_refptr<FontCustomPlatformData> FontCustomPlatformData::Create(
SharedBuffer* buffer,
String& ots_parse_message) {
DCHECK(buffer);
WebFontDecoder decoder;
sk_sp<SkTypeface> typeface = decoder.Decode(buffer);
if (!typeface) {
ots_parse_message = decoder.GetErrorString();
return nullptr;
}
return base::AdoptRef(
new FontCustomPlatformData(std::move(typeface), decoder.DecodedSize()));
}
bool FontCustomPlatformData::SupportsFormat(const String& format) {
// Support relevant format specifiers from
// https://drafts.csswg.org/css-fonts-4/#src-desc
return EqualIgnoringASCIICase(format, "woff") ||
EqualIgnoringASCIICase(format, "truetype") ||
EqualIgnoringASCIICase(format, "opentype") ||
EqualIgnoringASCIICase(format, "woff2") ||
EqualIgnoringASCIICase(format, "woff-variations") ||
EqualIgnoringASCIICase(format, "truetype-variations") ||
EqualIgnoringASCIICase(format, "opentype-variations") ||
EqualIgnoringASCIICase(format, "woff2-variations");
}
} // namespace blink
|
