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// Copyright 2021 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.h"
#include <memory>
#include "base/location.h"
#include "base/sequence_checker.h"
#include "base/threading/scoped_blocking_call.h"
#include "build/build_config.h"
#include "third_party/blink/public/common/font_access/font_enumeration_table.pb.h"
#if BUILDFLAG(IS_WIN)
#include "content/browser/font_access/font_enumeration_data_source_win.h"
#elif BUILDFLAG(IS_APPLE)
#include "content/browser/font_access/font_enumeration_data_source_mac.h"
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
#include "content/browser/font_access/font_enumeration_data_source_linux.h"
#endif // BUILDFLAG(IS_WIN)
namespace content {
namespace {
// FontEnumerationDataSource implementation for unsupported OSes.
class FontEnumerationDataSourceNull : public FontEnumerationDataSource {
public:
FontEnumerationDataSourceNull() { DETACH_FROM_SEQUENCE(sequence_checker_); }
FontEnumerationDataSourceNull(const FontEnumerationDataSourceNull&) = delete;
FontEnumerationDataSourceNull& operator=(
const FontEnumerationDataSourceNull&) = delete;
~FontEnumerationDataSourceNull() override {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
// FontEnumerationDataSource:
blink::FontEnumerationTable GetFonts(const std::string& locale) override {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Ensure that this method is called on a sequence that is allowed to do
// IO, even on OSes that don't have a FontEnumerationDataSource
// implementation yet.
base::ScopedBlockingCall scoped_blocking_call(
FROM_HERE, base::BlockingType::MAY_BLOCK);
blink::FontEnumerationTable font_enumeration_table;
return font_enumeration_table;
}
private:
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace
// static
std::unique_ptr<FontEnumerationDataSource> FontEnumerationDataSource::Create() {
#if BUILDFLAG(IS_WIN)
return std::make_unique<FontEnumerationDataSourceWin>();
#elif BUILDFLAG(IS_APPLE)
return std::make_unique<FontEnumerationDataSourceMac>();
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
return std::make_unique<FontEnumerationDataSourceLinux>();
#else
return std::make_unique<FontEnumerationDataSourceNull>();
#endif // BUILDFLAG(IS_WIN)
}
// static
bool FontEnumerationDataSource::IsOsSupported() {
// The structure below parallels Create(), for ease of maintenance.
#if BUILDFLAG(IS_WIN)
return true;
#elif BUILDFLAG(IS_APPLE)
return true;
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
return true;
#else
return false;
#endif // BUILDFLAG(IS_WIN)
}
} // namespace content
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