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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_SERVICE_THREAD_H_ |
| 6 #define COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_SERVICE_THREAD_H_ |
| 7 |
| 8 #include "base/files/file.h" |
| 9 #include "base/threading/thread.h" |
| 10 #include "components/font_service/public/interfaces/font_service.mojom.h" |
| 11 #include "third_party/skia/include/core/SkStream.h" |
| 12 #include "third_party/skia/include/core/SkTypeface.h" |
| 13 #include "third_party/skia/include/ports/SkFontConfigInterface.h" |
| 14 |
| 15 namespace font_service { |
| 16 namespace internal { |
| 17 |
| 18 class MappedFontFile; |
| 19 |
| 20 // The thread which services font requests. |
| 21 // |
| 22 // The SkFontConfigInterface is a global singleton which can be accessed from |
| 23 // multiple threads. However, mojo pipes are bound to a single thread. Because |
| 24 // of this mismatch, we create a thread which owns the mojo pipe, sends and |
| 25 // receives messages. The multiple threads which call through FontLoader class |
| 26 // do blocking message calls to this thread. |
| 27 class FontServiceThread : public base::Thread, |
| 28 public base::RefCountedThreadSafe<FontServiceThread> { |
| 29 public: |
| 30 explicit FontServiceThread(FontServicePtr font_service); |
| 31 |
| 32 // These methods are proxies which run on your thread, post a blocking task |
| 33 // to the FontServiceThread, and wait on an event signaled from the callback. |
| 34 bool MatchFamilyName(const char family_name[], |
| 35 SkTypeface::Style requested_style, |
| 36 SkFontConfigInterface::FontIdentity* out_font_identity, |
| 37 SkString* out_family_name, |
| 38 SkTypeface::Style* out_style); |
| 39 scoped_refptr<MappedFontFile> OpenStream( |
| 40 const SkFontConfigInterface::FontIdentity& identity); |
| 41 |
| 42 private: |
| 43 friend class base::RefCountedThreadSafe<FontServiceThread>; |
| 44 ~FontServiceThread() override; |
| 45 |
| 46 // Methods which run on the FontServiceThread. The public MatchFamilyName |
| 47 // calls this method, this method calls the mojo interface, and sets up the |
| 48 // callback to OnMatchFamilyNameComplete. |
| 49 void MatchFamilyNameImpl( |
| 50 base::WaitableEvent* done_event, |
| 51 const char family_name[], |
| 52 SkTypeface::Style requested_style, |
| 53 bool* out_valid, |
| 54 SkFontConfigInterface::FontIdentity* out_font_identity, |
| 55 SkString* out_family_name, |
| 56 SkTypeface::Style* out_style); |
| 57 |
| 58 // Called on the FontServiceThread in response to receiving a message from |
| 59 // our MatchFamily mojo IPC. This writes the data returned by mojo, and then |
| 60 // signals |done_event| to wake up the other thread. |
| 61 void OnMatchFamilyNameComplete( |
| 62 base::WaitableEvent* done_event, |
| 63 bool* out_valid, |
| 64 SkFontConfigInterface::FontIdentity* out_font_identity, |
| 65 SkString* out_family_name, |
| 66 SkTypeface::Style* out_style, |
| 67 FontIdentityPtr font_identity, |
| 68 mojo::String family_name, |
| 69 TypefaceStyle style); |
| 70 |
| 71 // Implementation of OpenStream; same threading restrictions as MatchFamily. |
| 72 void OpenStreamImpl(base::WaitableEvent* done_event, |
| 73 base::File* output_file, |
| 74 const uint32_t id_number); |
| 75 void OnOpenStreamComplete(base::WaitableEvent* done_event, |
| 76 base::File* output_file, |
| 77 mojo::ScopedHandle handle); |
| 78 |
| 79 // base::Thread |
| 80 void Init() override; |
| 81 void CleanUp() override; |
| 82 |
| 83 // This member is used to safely pass data from one thread to another. It is |
| 84 // set in the constructor and is consumed in Init(). |
| 85 mojo::InterfacePtrInfo<FontService> font_service_info_; |
| 86 |
| 87 // This member is set in Init(). It takes |font_service_info_|, which is |
| 88 // non-thread bound, and binds it to the newly created thread. |
| 89 mojo::InterfacePtr<FontService> font_service_; |
| 90 |
| 91 DISALLOW_COPY_AND_ASSIGN(FontServiceThread); |
| 92 }; |
| 93 |
| 94 } // namespace internal |
| 95 } // namespace font_service |
| 96 |
| 97 #endif // COMPONENTS_FONT_SERVICE_PUBLIC_CPP_FONT_SERVICE_THREAD_H_ |
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