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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROME_BROWSER_IMAGE_DECODER_H_ | 5 #ifndef CHROME_BROWSER_IMAGE_DECODER_H_ |
6 #define CHROME_BROWSER_IMAGE_DECODER_H_ | 6 #define CHROME_BROWSER_IMAGE_DECODER_H_ |
7 | 7 |
8 #include <map> | |
8 #include <string> | 9 #include <string> |
9 #include <vector> | 10 #include <vector> |
10 | 11 |
11 #include "base/compiler_specific.h" | 12 #include "base/compiler_specific.h" |
13 #include "base/lazy_instance.h" | |
12 #include "base/memory/ref_counted.h" | 14 #include "base/memory/ref_counted.h" |
13 #include "base/threading/sequenced_worker_pool.h" | 15 #include "base/threading/sequenced_worker_pool.h" |
16 #include "content/public/browser/utility_process_host.h" | |
14 #include "content/public/browser/utility_process_host_client.h" | 17 #include "content/public/browser/utility_process_host_client.h" |
15 | 18 |
16 class SkBitmap; | 19 class SkBitmap; |
17 | 20 |
18 // Decodes an image in a sandboxed process. | 21 // Singleton to decode images in a sandboxed process. |
19 class ImageDecoder : public content::UtilityProcessHostClient { | 22 class ImageDecoder { |
20 public: | 23 public: |
21 class Delegate { | 24 class Delegate { |
22 public: | 25 public: |
23 // Called when image is decoded. | 26 // Called when image is decoded. |
24 // |decoder| is used to identify the image in case of decoding several | 27 virtual void OnImageDecoded(const SkBitmap& decoded_image) = 0; |
25 // images simultaneously. | |
26 virtual void OnImageDecoded(const ImageDecoder* decoder, | |
27 const SkBitmap& decoded_image) = 0; | |
28 | 28 |
29 // Called when decoding image failed. Delegate can do some cleanup in | 29 // Called when decoding image failed. Delegate can do some cleanup in |
30 // this handler. | 30 // this handler. |
31 virtual void OnDecodeImageFailed(const ImageDecoder* decoder) {} | 31 virtual void OnDecodeImageFailed() {} |
32 | 32 |
33 protected: | 33 protected: |
34 virtual ~Delegate() {} | 34 virtual ~Delegate() {} |
35 }; | 35 }; |
36 | 36 |
37 enum ImageCodec { | 37 enum ImageCodec { |
38 DEFAULT_CODEC = 0, // Uses WebKit image decoding (via WebImage). | 38 DEFAULT_CODEC = 0, // Uses WebKit image decoding (via WebImage). |
39 ROBUST_JPEG_CODEC, // Restrict decoding to robust jpeg codec. | 39 ROBUST_JPEG_CODEC, // Restrict decoding to robust jpeg codec. |
40 }; | 40 }; |
41 | 41 |
42 ImageDecoder(Delegate* delegate, | 42 static ImageDecoder* GetInstance(); |
43 const std::string& image_data, | |
44 ImageCodec image_codec); | |
45 | |
46 ImageDecoder(Delegate* delegate, | |
47 const std::vector<char>& image_data, | |
48 ImageCodec image_codec); | |
49 | 43 |
50 // Starts asynchronous image decoding. Once finished, the callback will be | 44 // Starts asynchronous image decoding. Once finished, the callback will be |
51 // posted back to |task_runner|. | 45 // posted back to |task_runner|. |
52 void Start(scoped_refptr<base::SequencedTaskRunner> task_runner); | 46 void Start(Delegate* delegate, |
53 | 47 const std::string& image_data, |
54 const std::vector<unsigned char>& get_image_data() const { | 48 ImageCodec image_codec, |
55 return image_data_; | 49 scoped_refptr<base::SequencedTaskRunner> task_runner, |
56 } | 50 bool shrink_to_fit); |
57 | |
58 void set_delegate(Delegate* delegate) { delegate_ = delegate; } | |
59 void set_shrink_to_fit(bool shrink_to_fit) { shrink_to_fit_ = shrink_to_fit; } | |
60 | 51 |
61 private: | 52 private: |
62 // It's a reference counted object, so destructor is private. | 53 friend struct base::DefaultLazyInstanceTraits<ImageDecoder>; |
63 ~ImageDecoder() override; | 54 ImageDecoder(); |
55 ~ImageDecoder(); | |
64 | 56 |
65 // Overidden from UtilityProcessHostClient: | 57 class ImageDecoderImpl : public content::UtilityProcessHostClient { |
66 bool OnMessageReceived(const IPC::Message& message) override; | 58 public: |
59 ImageDecoderImpl(); | |
60 void Start(Delegate* delegate, | |
61 const std::string& image_data, | |
62 ImageCodec image_codec, | |
63 scoped_refptr<base::SequencedTaskRunner> task_runner, | |
64 bool shrink_to_fit); | |
67 | 65 |
68 // IPC message handlers. | 66 private: |
69 void OnDecodeImageSucceeded(const SkBitmap& decoded_image); | 67 // It's a reference counted object, so destructor is private. |
70 void OnDecodeImageFailed(); | 68 ~ImageDecoderImpl() override; |
71 | 69 |
72 // Launches sandboxed process that will decode the image. | 70 // Contains attributes we need to know about each image decode |
73 void DecodeImageInSandbox(const std::vector<unsigned char>& image_data); | 71 // request we send. |
72 struct RequestInfo { | |
73 RequestInfo(Delegate* delegate, | |
74 scoped_refptr<base::SequencedTaskRunner> task_runner); | |
75 ~RequestInfo(); | |
74 | 76 |
75 Delegate* delegate_; | 77 Delegate* delegate; |
76 std::vector<unsigned char> image_data_; | 78 scoped_refptr<base::SequencedTaskRunner> task_runner; |
77 const ImageCodec image_codec_; | 79 }; |
78 scoped_refptr<base::SequencedTaskRunner> task_runner_; | 80 |
79 bool shrink_to_fit_; // if needed for IPC msg size limit | 81 typedef std::map<int, RequestInfo*> RequestMap; |
dcheng
2015/03/10 15:49:12
I have the vague impression that using foo = bar;
Theresa
2015/03/10 23:50:54
Acknowledged.
| |
82 | |
83 // Starts UtilityProcessHost in batch mode and calls | |
84 // PostDelayedStopBatchModeTask. | |
85 void StartBatchMode(Delegate* delegate, | |
86 const std::string& image_data, | |
87 ImageCodec image_codec, | |
88 bool shrink_to_fit); | |
89 | |
90 // Posts a delayed task to stop the UtilityProcessHost running in | |
91 // batch mode. | |
92 void PostDelayedStopBatchModeTask(); | |
93 | |
94 // Stops batch mode if no requests have come in since | |
95 // |batch_mode_timeout_seconds_|; else calls PostDelayedStopBatchModeTask. | |
96 void StopBatchMode(); | |
97 | |
98 // Overidden from UtilityProcessHostClient. | |
99 bool OnMessageReceived(const IPC::Message& message) override; | |
100 | |
101 // IPC message handlers. | |
102 void OnDecodeImageSucceeded(const SkBitmap& decoded_image, int id); | |
103 void OnDecodeImageFailed(int id); | |
104 | |
105 void NotifyDelegateDecodeSucceeded(const SkBitmap& decoded_image, | |
106 Delegate* delegate); | |
107 void NotifyDelegateDecodeFailed(Delegate* delegate); | |
108 | |
109 // Sends a request to the sandboxed process to decode the image. | |
110 void DecodeImageInSandbox(Delegate* delegate, | |
111 const std::vector<unsigned char>& image_data, | |
112 ImageCodec image_codec, | |
113 bool shrink_to_fit, | |
114 int delegate_id); | |
115 | |
116 // id to use for the next Start request that comes in. | |
117 int delegate_id_counter_; | |
118 | |
119 // Map of request id's to RequestInfo | |
120 RequestMap request_info_id_map_; | |
121 | |
122 // The SequencedTaskRunner provided when Start is called before batch mode | |
123 // is started. base::Bind does not accept scoped_refptr objects, so the | |
124 // value must be saved instead. | |
dcheng
2015/03/10 15:49:12
I don't quite follow this comment. base::Bind() do
Theresa
2015/03/10 23:50:54
If I recall correctly, I was seeing this message (
| |
125 scoped_refptr<base::SequencedTaskRunner> task_runner_at_start_; | |
126 | |
127 // The UtilityProcessHost requests are sent to. | |
128 base::WeakPtr<content::UtilityProcessHost> utility_process_host_; | |
129 | |
130 // The time Start was last called. | |
131 base::TimeTicks last_request_; | |
132 | |
133 // How many seconds to wait after the last request has been received | |
134 // before ending batch mode. | |
135 const int kBatchModeTimeoutSeconds = 5; | |
136 | |
137 // True iff utility_process_host_ has been created and started in | |
138 // batch bode. | |
139 bool batch_mode_started_; | |
140 }; | |
141 | |
142 const scoped_refptr<ImageDecoderImpl> image_decoder_impl_; | |
80 | 143 |
81 DISALLOW_COPY_AND_ASSIGN(ImageDecoder); | 144 DISALLOW_COPY_AND_ASSIGN(ImageDecoder); |
82 }; | 145 }; |
83 | 146 |
84 #endif // CHROME_BROWSER_IMAGE_DECODER_H_ | 147 #endif // CHROME_BROWSER_IMAGE_DECODER_H_ |
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