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1 // Copyright 2014 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 ATHENA_CONTENT_CONTENT_PROXY_H_ | |
6 #define ATHENA_CONTENT_CONTENT_PROXY_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/ref_counted_memory.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/memory/weak_ptr.h" | |
12 #include "content/public/browser/readback_types.h" | |
13 #include "ui/gfx/image/image_skia.h" | |
14 | |
15 namespace views { | |
16 class WebView; | |
17 } | |
18 | |
19 namespace athena { | |
20 | |
21 class ProxyImageData; | |
22 | |
23 // This object creates and holds proxy content which gets shown instead of the | |
24 // actual web content, generated from the passed |web_view|. | |
25 // The created |proxy_content_| will be destroyed with the destruction of this | |
26 // object. | |
27 // Calling EvictContent() will release the rendered content. | |
28 // When ContentGetsDestroyed() gets called, the old view will be made visible | |
29 // and then the link to the |web_view_| will get severed. | |
30 class ContentProxy { | |
31 public: | |
32 // Creates the object by creating a sized down |web_view| layer. | |
33 explicit ContentProxy(views::WebView* web_view); | |
34 // TODO(skuhne): Add a function to create this object from a passed PNG, so | |
35 // that we can create it from a session restore. | |
36 | |
37 // With the destruction of the object, the layer should get destroyed and the | |
38 // content should become visible again. | |
39 virtual ~ContentProxy(); | |
40 | |
41 // Called when the content will get unloaded. | |
42 void ContentWillUnload(); | |
43 | |
44 // Can be called to save resources by creating a layer with a solid color | |
45 // instead of creating a content image layer. | |
46 // Note: Currently the GPU does create a full size texture and fills it with | |
47 // the given color - so there isn't really memory savings yet. | |
48 void EvictContent(); | |
49 | |
50 // Get the image of the content. If there is no image known, an empty image | |
51 // will be returned. | |
52 gfx::ImageSkia GetContentImage(); | |
53 | |
54 // The content is about to get destroyed by its creator. | |
55 // Note: This function should only be used by AppActivity. | |
56 void OnPreContentDestroyed(); | |
57 | |
58 private: | |
59 // Make the original (web)content visible. This call should only be paired | |
60 // with HideOriginalContent. | |
61 void ShowOriginalContent(); | |
62 | |
63 // Make the content invisible. This call should only be paired with | |
64 // MakeVisible. | |
65 void HideOriginalContent(); | |
66 | |
67 // Creates proxy content from |web_view_|. | |
68 void CreateProxyContent(); | |
69 | |
70 // Creates an image from the current content. | |
71 bool CreateContentImage(); | |
72 | |
73 // Called once the content was read back. | |
74 void OnContentImageRead(const SkBitmap& bitmap, | |
75 content::ReadbackResponse response); | |
76 | |
77 // Called once the image content has been converted to PNG. | |
78 void OnContentImageEncodeComplete(scoped_refptr<ProxyImageData> image); | |
79 | |
80 // The web view which was passed on creation and is associated with this | |
81 // object. It will be shown when OnPreContentDestroyed() gets called and then | |
82 // set to nullptr. The ownership remains with the creator. | |
83 views::WebView* web_view_; | |
84 | |
85 // While we are doing our PNG encode, we keep the read back image to have | |
86 // something which we can pass back to the overview mode. (It would make no | |
87 // sense to the user to see that more recent windows get painted later than | |
88 // older ones). | |
89 gfx::ImageSkia raw_image_; | |
90 | |
91 // True if the content is visible. | |
92 bool content_visible_; | |
93 | |
94 // True if the content is loaded and needs a re-layout when it gets shown | |
95 // again. | |
96 bool content_loaded_; | |
97 | |
98 // True if a content creation was kicked off once. This ensures that the | |
99 // function is never called twice. | |
100 bool content_creation_called_; | |
101 | |
102 // The PNG image data. | |
103 scoped_refptr<base::RefCountedBytes> png_data_; | |
104 | |
105 // Creating an encoded image from the content will be asynchronous. Use a | |
106 // weakptr for the callback to make sure that the read back / encoding image | |
107 // completion callback does not trigger on a destroyed ContentProxy. | |
108 base::WeakPtrFactory<ContentProxy> proxy_content_to_image_factory_; | |
109 | |
110 DISALLOW_COPY_AND_ASSIGN(ContentProxy); | |
111 }; | |
112 | |
113 } // namespace athena | |
114 | |
115 #endif // ATHENA_CONTENT_CONTENT_PROXY_H_ | |
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