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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SERVICES_FONT_PUBLIC_CPP_FONT_SERVICE_THREAD_H_
#define COMPONENTS_SERVICES_FONT_PUBLIC_CPP_FONT_SERVICE_THREAD_H_
#include <stdint.h>
#include <set>
#include "base/files/file.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread.h"
#include "base/threading/thread_checker.h"
#include "components/services/font/public/interfaces/font_service.mojom.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "third_party/skia/include/ports/SkFontConfigInterface.h"
namespace font_service {
namespace internal {
class MappedFontFile;
// The thread which services font requests.
//
// The SkFontConfigInterface is a global singleton which can be accessed from
// multiple threads. However, mojo pipes are bound to a single thread. Because
// of this mismatch, we create a thread which owns the mojo pipe, sends and
// receives messages. The multiple threads which call through FontLoader class
// do blocking message calls to this thread.
class FontServiceThread : public base::Thread,
public base::RefCountedThreadSafe<FontServiceThread> {
public:
explicit FontServiceThread(mojom::FontServicePtr font_service);
// These methods are proxies which run on your thread, post a blocking task
// to the FontServiceThread, and wait on an event signaled from the callback.
bool MatchFamilyName(const char family_name[],
SkFontStyle requested_style,
SkFontConfigInterface::FontIdentity* out_font_identity,
SkString* out_family_name,
SkFontStyle* out_style);
scoped_refptr<MappedFontFile> OpenStream(
const SkFontConfigInterface::FontIdentity& identity);
bool FallbackFontForCharacter(
uint32_t character,
std::string locale,
font_service::mojom::FontIdentityPtr* out_font_identity,
std::string* out_family_name,
bool* out_is_bold,
bool* out_is_italic);
bool FontRenderStyleForStrike(
std::string family,
uint32_t size,
bool is_italic,
bool is_bold,
float device_scale_factor,
font_service::mojom::FontRenderStylePtr* out_font_render_style);
void MatchFontWithFallback(std::string family,
bool is_bold,
bool is_italic,
uint32_t charset,
uint32_t fallbackFamilyType,
base::File* out_font_file_handle);
private:
friend class base::RefCountedThreadSafe<FontServiceThread>;
~FontServiceThread() override;
// Methods which run on the FontServiceThread. The public MatchFamilyName
// calls this method, this method calls the mojo interface, and sets up the
// callback to OnMatchFamilyNameComplete.
void MatchFamilyNameImpl(
base::WaitableEvent* done_event,
const char family_name[],
SkFontStyle requested_style,
bool* out_valid,
SkFontConfigInterface::FontIdentity* out_font_identity,
SkString* out_family_name,
SkFontStyle* out_style);
// Called on the FontServiceThread in response to receiving a message from
// our MatchFamily mojo IPC. This writes the data returned by mojo, and then
// signals |done_event| to wake up the other thread.
void OnMatchFamilyNameComplete(
base::WaitableEvent* done_event,
bool* out_valid,
SkFontConfigInterface::FontIdentity* out_font_identity,
SkString* out_family_name,
SkFontStyle* out_style,
mojom::FontIdentityPtr font_identity,
const std::string& family_name,
mojom::TypefaceStylePtr style);
// Implementation of OpenStream; same threading restrictions as MatchFamily.
void OpenStreamImpl(base::WaitableEvent* done_event,
base::File* output_file,
const uint32_t id_number);
void OnOpenStreamComplete(base::WaitableEvent* done_event,
base::File* output_file,
base::File file);
void FallbackFontForCharacterImpl(
base::WaitableEvent* done_event,
uint32_t character,
std::string locale,
bool* out_is_valid,
font_service::mojom::FontIdentityPtr* out_font_identity,
std::string* out_family_name,
bool* out_is_bold,
bool* out_is_italic);
void OnFallbackFontForCharacterComplete(
base::WaitableEvent* done_event,
bool* out_valid,
font_service::mojom::FontIdentityPtr* out_font_identity,
std::string* out_family_name,
bool* out_is_bold,
bool* out_is_italic,
mojom::FontIdentityPtr font_identity,
const std::string& family_name,
bool is_bold,
bool is_italic);
void FontRenderStyleForStrikeImpl(
base::WaitableEvent* done_event,
std::string family,
uint32_t size,
bool is_italic,
bool is_bold,
float device_scale_factor,
bool* out_valid,
mojom::FontRenderStylePtr* out_font_render_style);
void OnFontRenderStyleForStrikeComplete(
base::WaitableEvent* done_event,
bool* out_valid,
mojom::FontRenderStylePtr* out_font_render_style,
mojom::FontRenderStylePtr font_render_style);
void MatchFontWithFallbackImpl(base::WaitableEvent* done_event,
std::string family,
bool is_bold,
bool is_italic,
uint32_t charset,
uint32_t fallbackFamilyType,
base::File* out_font_file_handle);
void OnMatchFontWithFallbackComplete(base::WaitableEvent* done_event,
base::File* out_font_file_handle,
base::File file);
// Connection to |font_service_| has gone away. Called on the background
// thread.
void OnFontServiceConnectionError();
// base::Thread
void Init() override;
void CleanUp() override;
// This member is used to safely pass data from one thread to another. It is
// set in the constructor and is consumed in Init().
mojo::InterfacePtrInfo<mojom::FontService> font_service_info_;
// This member is set in Init(). It takes |font_service_info_|, which is
// non-thread bound, and binds it to the newly created thread.
mojo::InterfacePtr<mojom::FontService> font_service_;
// All WaitableEvents supplied to OpenStreamImpl() and the other *Impl()
// functions are added here while waiting on the response from the
// |font_service_| (FontService::OpenStream() or other such functions were
// called, but the callbacks have not been processed yet). If |font_service_|
// gets an error during this time all events in |pending_waitable_events_| are
// signaled. This is necessary as when the pipe is closed the callbacks are
// never received.
std::set<base::WaitableEvent*> pending_waitable_events_;
THREAD_CHECKER(thread_checker_);
base::WeakPtrFactory<FontServiceThread> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(FontServiceThread);
};
} // namespace internal
} // namespace font_service
#endif // COMPONENTS_SERVICES_FONT_PUBLIC_CPP_FONT_SERVICE_THREAD_H_
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