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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/font_access/font_enumeration_data_source_linux.h"
#include <fontconfig/fontconfig.h>
#include <memory>
#include <set>
#include "base/check_op.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/notreached.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "third_party/blink/public/common/font_access/font_enumeration_table.pb.h"
namespace content {
namespace {
std::unique_ptr<FcPattern, decltype(&FcPatternDestroy)> CreateFormatPattern(
const char* format) {
std::unique_ptr<FcPattern, decltype(&FcPatternDestroy)> pattern(
FcPatternCreate(), FcPatternDestroy);
FcPatternAddBool(pattern.get(), FC_SCALABLE, FcTrue);
FcPatternAddString(pattern.get(), FC_FONTFORMAT,
reinterpret_cast<const FcChar8*>(format));
return pattern;
}
// Returns a font set comprising of fonts in the provided object set.
FcFontSet* ListFonts(FcObjectSet* object_set) {
FcFontSet* output = FcFontSetCreate();
// See https://www.freetype.org/freetype2/docs/reference/ft2-font_formats.html
// for the list of possible formats.
const char* allowed_formats[] = {"TrueType", "CFF"};
for (const auto* format : allowed_formats) {
auto format_pattern = CreateFormatPattern(format);
std::unique_ptr<FcFontSet, decltype(&FcFontSetDestroy)> fontset(
FcFontList(nullptr, format_pattern.get(), object_set),
FcFontSetDestroy);
for (int j = 0; j < fontset->nfont; ++j) {
FcPattern* font = UNSAFE_TODO(fontset->fonts[j]);
// Increments the refcount for the font.
FcPatternReference(font);
FcBool result = FcFontSetAdd(output, font);
DCHECK_EQ(result, FcTrue);
}
}
return output;
}
} // namespace
FontEnumerationDataSourceLinux::FontEnumerationDataSourceLinux() {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
FontEnumerationDataSourceLinux::~FontEnumerationDataSourceLinux() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
blink::FontEnumerationTable FontEnumerationDataSourceLinux::GetFonts(
const std::string& locale) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
blink::FontEnumerationTable font_enumeration_table;
std::unique_ptr<FcObjectSet, decltype(&FcObjectSetDestroy)> object_set(
FcObjectSetBuild(FC_POSTSCRIPT_NAME, FC_FULLNAME, FC_FAMILY, FC_STYLE,
nullptr),
FcObjectSetDestroy);
std::unique_ptr<FcFontSet, decltype(&FcFontSetDestroy)> fontset(
ListFonts(object_set.get()), FcFontSetDestroy);
// Used to filter duplicates.
std::set<std::string> fonts_seen;
for (int i = 0; i < fontset->nfont; ++i) {
char* postscript_name = nullptr;
if (FcPatternGetString(UNSAFE_TODO(fontset->fonts[i]), FC_POSTSCRIPT_NAME,
0, reinterpret_cast<FcChar8**>(&postscript_name)) !=
FcResultMatch) {
// Skip incomplete or malformed font.
continue;
}
char* full_name = nullptr;
if (FcPatternGetString(UNSAFE_TODO(fontset->fonts[i]), FC_FULLNAME, 0,
reinterpret_cast<FcChar8**>(&full_name)) !=
FcResultMatch) {
// Skip incomplete or malformed font.
continue;
}
char* family = nullptr;
if (FcPatternGetString(UNSAFE_TODO(fontset->fonts[i]), FC_FAMILY, 0,
reinterpret_cast<FcChar8**>(&family)) !=
FcResultMatch) {
// Skip incomplete or malformed font.
continue;
}
char* style = nullptr;
if (FcPatternGetString(UNSAFE_TODO(fontset->fonts[i]), FC_STYLE, 0,
reinterpret_cast<FcChar8**>(&style)) !=
FcResultMatch) {
// Skip incomplete or malformed font.
continue;
}
auto it_and_success = fonts_seen.emplace(postscript_name);
if (!it_and_success.second) {
// Skip duplicate.
continue;
}
blink::FontEnumerationTable_FontData* data =
font_enumeration_table.add_fonts();
data->set_postscript_name(postscript_name);
data->set_full_name(full_name);
data->set_family(family);
data->set_style(style);
}
return font_enumeration_table;
}
} // namespace content
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