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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_cache.h"
#include <algorithm>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include "base/i18n/rtl.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/scoped_refptr.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/sequence_bound.h"
#include "base/types/pass_key.h"
#include "content/browser/font_access/font_enumeration_data_source.h"
#include "third_party/blink/public/common/font_access/font_enumeration_table.pb.h"
#include "third_party/blink/public/mojom/font_access/font_access.mojom.h"
namespace content {
// static
base::SequenceBound<FontEnumerationCache> FontEnumerationCache::Create() {
return base::SequenceBound<FontEnumerationCache>(
base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::BEST_EFFORT}),
FontEnumerationDataSource::Create(), std::nullopt,
base::PassKey<FontEnumerationCache>());
}
// static
base::SequenceBound<FontEnumerationCache>
FontEnumerationCache::CreateForTesting(
scoped_refptr<base::SequencedTaskRunner> task_runner,
std::unique_ptr<FontEnumerationDataSource> data_source,
std::optional<std::string> locale_override) {
DCHECK(data_source);
return base::SequenceBound<FontEnumerationCache>(
std::move(task_runner), std::move(data_source),
std::move(locale_override), base::PassKey<FontEnumerationCache>());
}
FontEnumerationCache::FontEnumerationCache(
std::unique_ptr<FontEnumerationDataSource> data_source,
std::optional<std::string> locale_override,
base::PassKey<FontEnumerationCache>)
: data_source_(std::move(data_source)),
locale_override_(std::move(locale_override)) {
DCHECK(data_source_);
}
FontEnumerationCache::~FontEnumerationCache() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
FontEnumerationData FontEnumerationCache::GetFontEnumerationData() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!initialized_) {
std::string locale =
locale_override_.value_or(base::i18n::GetConfiguredLocale());
blink::FontEnumerationTable font_data = data_source_->GetFonts(locale);
BuildEnumerationCache(font_data);
initialized_ = true;
}
DCHECK(initialized_);
return {.status = data_.status, .font_data = data_.font_data.Duplicate()};
}
void FontEnumerationCache::BuildEnumerationCache(
blink::FontEnumerationTable& table) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!FontEnumerationDataSource::IsOsSupported()) {
data_.status = blink::mojom::FontEnumerationStatus::kUnimplemented;
return;
}
// Postscript names, according to spec, are expected to be encoded in a subset
// of ASCII. See:
// https://docs.microsoft.com/en-us/typography/opentype/spec/name This is why
// a "simple" byte-wise comparison is used.
std::sort(table.mutable_fonts()->begin(), table.mutable_fonts()->end(),
[](const blink::FontEnumerationTable_FontData& a,
const blink::FontEnumerationTable_FontData& b) {
return a.postscript_name() < b.postscript_name();
});
base::MappedReadOnlyRegion font_data_region =
base::ReadOnlySharedMemoryRegion::Create(table.ByteSizeLong());
if (!font_data_region.mapping.IsValid()) {
data_.status = blink::mojom::FontEnumerationStatus::kUnexpectedError;
return;
}
DCHECK_GE(font_data_region.mapping.size(), table.ByteSizeLong());
base::span<uint8_t> font_mem(font_data_region.mapping);
if (!table.SerializeToArray(font_mem.data(), font_mem.size())) {
data_.status = blink::mojom::FontEnumerationStatus::kUnexpectedError;
return;
}
data_.status = blink::mojom::FontEnumerationStatus::kOk;
data_.font_data = std::move(font_data_region.region);
return;
}
} // namespace content
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