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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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